diff --git a/java/src/com/android/inputmethod/latin/utils/ImportantNoticeUtils.java b/java/src/com/android/inputmethod/latin/utils/ImportantNoticeUtils.java
index 8b70778..ea406fa 100644
--- a/java/src/com/android/inputmethod/latin/utils/ImportantNoticeUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/ImportantNoticeUtils.java
@@ -23,15 +23,24 @@
 import android.text.TextUtils;
 import android.util.Log;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.R;
 
+import java.util.concurrent.TimeUnit;
+
 public final class ImportantNoticeUtils {
     private static final String TAG = ImportantNoticeUtils.class.getSimpleName();
 
     // {@link SharedPreferences} name to save the last important notice version that has been
     // displayed to users.
     private static final String PREFERENCE_NAME = "important_notice_pref";
-    private static final String KEY_IMPORTANT_NOTICE_VERSION = "important_notice_version";
+    @UsedForTesting
+    static final String KEY_IMPORTANT_NOTICE_VERSION = "important_notice_version";
+    @UsedForTesting
+    static final String KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE =
+            "timestamp_of_first_important_notice";
+    @UsedForTesting
+    static final long TIMEOUT_OF_IMPORTANT_NOTICE = TimeUnit.HOURS.toMillis(23);
     public static final int VERSION_TO_ENABLE_PERSONALIZED_SUGGESTIONS = 1;
 
     // Copy of the hidden {@link Settings.Secure#USER_SETUP_COMPLETE} settings key.
@@ -56,15 +65,18 @@
         }
     }
 
-    private static SharedPreferences getImportantNoticePreferences(final Context context) {
+    @UsedForTesting
+    static SharedPreferences getImportantNoticePreferences(final Context context) {
         return context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
     }
 
-    private static int getCurrentImportantNoticeVersion(final Context context) {
+    @UsedForTesting
+    static int getCurrentImportantNoticeVersion(final Context context) {
         return context.getResources().getInteger(R.integer.config_important_notice_version);
     }
 
-    private static int getLastImportantNoticeVersion(final Context context) {
+    @UsedForTesting
+    static int getLastImportantNoticeVersion(final Context context) {
         return getImportantNoticePreferences(context).getInt(KEY_IMPORTANT_NOTICE_VERSION, 0);
     }
 
@@ -77,6 +89,20 @@
         return getCurrentImportantNoticeVersion(context) > lastVersion;
     }
 
+    @UsedForTesting
+    static boolean hasTimeoutPassed(final Context context, final long currentTimeInMillis) {
+        final SharedPreferences prefs = getImportantNoticePreferences(context);
+        if (!prefs.contains(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE)) {
+            prefs.edit()
+                    .putLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE, currentTimeInMillis)
+                    .apply();
+        }
+        final long firstDisplayTimeInMillis = prefs.getLong(
+                KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE, currentTimeInMillis);
+        final long elapsedTime = currentTimeInMillis - firstDisplayTimeInMillis;
+        return elapsedTime >= TIMEOUT_OF_IMPORTANT_NOTICE;
+    }
+
     public static boolean shouldShowImportantNotice(final Context context) {
         if (!hasNewImportantNotice(context)) {
             return false;
@@ -88,6 +114,10 @@
         if (isInSystemSetupWizard(context)) {
             return false;
         }
+        if (hasTimeoutPassed(context, System.currentTimeMillis())) {
+            updateLastImportantNoticeVersion(context);
+            return false;
+        }
         return true;
     }
 
@@ -95,11 +125,12 @@
         getImportantNoticePreferences(context)
                 .edit()
                 .putInt(KEY_IMPORTANT_NOTICE_VERSION, getNextImportantNoticeVersion(context))
+                .remove(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE)
                 .apply();
     }
 
     public static String getNextImportantNoticeTitle(final Context context) {
-        final int nextVersion = getCurrentImportantNoticeVersion(context);
+        final int nextVersion = getNextImportantNoticeVersion(context);
         final String[] importantNoticeTitleArray = context.getResources().getStringArray(
                 R.array.important_notice_title_array);
         if (nextVersion > 0 && nextVersion < importantNoticeTitleArray.length) {
diff --git a/tests/src/com/android/inputmethod/latin/utils/ImportantNoticeUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/ImportantNoticeUtilsTests.java
new file mode 100644
index 0000000..819d763
--- /dev/null
+++ b/tests/src/com/android/inputmethod/latin/utils/ImportantNoticeUtilsTests.java
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.utils;
+
+import static com.android.inputmethod.latin.utils.ImportantNoticeUtils.KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE;
+import static com.android.inputmethod.latin.utils.ImportantNoticeUtils.KEY_IMPORTANT_NOTICE_VERSION;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+import android.text.TextUtils;
+
+import java.util.concurrent.TimeUnit;
+
+@SmallTest
+public class ImportantNoticeUtilsTests extends AndroidTestCase {
+    // This should be aligned with R.integer.config_important_notice_version.
+    private static final int CURRENT_IMPORTANT_NOTICE_VERSION = 1;
+
+    private ImportantNoticePreferences mImportantNoticePreferences;
+
+    private static class ImportantNoticePreferences {
+        private final SharedPreferences mPref;
+
+        private Integer mVersion;
+        private Long mLastTime;
+
+        public ImportantNoticePreferences(final Context context) {
+            mPref = ImportantNoticeUtils.getImportantNoticePreferences(context);
+        }
+
+        private Integer getInt(final String key) {
+            if (mPref.contains(key)) {
+                return mPref.getInt(key, 0);
+            }
+            return null;
+        }
+
+        public Long getLong(final String key) {
+            if (mPref.contains(key)) {
+                return mPref.getLong(key, 0);
+            }
+            return null;
+        }
+
+        private void putInt(final String key, final Integer value) {
+            if (value == null) {
+                removePreference(key);
+            } else {
+                mPref.edit().putInt(key, value).apply();
+            }
+        }
+
+        private void putLong(final String key, final Long value) {
+            if (value == null) {
+                removePreference(key);
+            } else {
+                mPref.edit().putLong(key, value).apply();
+            }
+        }
+
+        private void removePreference(final String key) {
+            mPref.edit().remove(key).apply();
+        }
+
+        public void save() {
+            mVersion = getInt(KEY_IMPORTANT_NOTICE_VERSION);
+            mLastTime = getLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE);
+        }
+
+        public void restore() {
+            putInt(KEY_IMPORTANT_NOTICE_VERSION, mVersion);
+            putLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE, mLastTime);
+        }
+
+        public void clear() {
+            removePreference(KEY_IMPORTANT_NOTICE_VERSION);
+            removePreference(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE);
+        }
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        mImportantNoticePreferences = new ImportantNoticePreferences(getContext());
+        mImportantNoticePreferences.save();
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+        super.tearDown();
+        mImportantNoticePreferences.restore();
+    }
+
+    public void testCurrentVersion() {
+        assertEquals("Current version", CURRENT_IMPORTANT_NOTICE_VERSION,
+                ImportantNoticeUtils.getCurrentImportantNoticeVersion(getContext()));
+    }
+
+    public void testUpdateVersion() {
+        mImportantNoticePreferences.clear();
+
+        assertEquals("Current boolean before update", true,
+                ImportantNoticeUtils.shouldShowImportantNotice(getContext()));
+        assertEquals("Last version before update", 0,
+                ImportantNoticeUtils.getLastImportantNoticeVersion(getContext()));
+        assertEquals("Next version before update ", 1,
+                ImportantNoticeUtils.getNextImportantNoticeVersion(getContext()));
+        assertEquals("Current title before update", false, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeTitle(getContext())));
+        assertEquals("Current contents before update", false, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeContents(getContext())));
+
+        ImportantNoticeUtils.updateLastImportantNoticeVersion(getContext());
+
+        assertEquals("Current boolean after update", false,
+                ImportantNoticeUtils.shouldShowImportantNotice(getContext()));
+        assertEquals("Last version after update", 1,
+                ImportantNoticeUtils.getLastImportantNoticeVersion(getContext()));
+        assertEquals("Next version after update", 2,
+                ImportantNoticeUtils.getNextImportantNoticeVersion(getContext()));
+        assertEquals("Current title after update", true, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeTitle(getContext())));
+        assertEquals("Current contents after update", true, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeContents(getContext())));
+    }
+
+    private static void sleep(final long millseconds) {
+        try { Thread.sleep(millseconds); } catch (final Exception e) { /* ignore */ }
+    }
+
+    public void testTimeout() {
+        final long lastTime = System.currentTimeMillis()
+                - ImportantNoticeUtils.TIMEOUT_OF_IMPORTANT_NOTICE
+                + TimeUnit.MILLISECONDS.toMillis(1000);
+        mImportantNoticePreferences.clear();
+        assertEquals("Before set last time", null,
+                mImportantNoticePreferences.getLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE));
+        assertEquals("Set last time", false,
+                ImportantNoticeUtils.hasTimeoutPassed(getContext(), lastTime));
+        assertEquals("After set last time", (Long)lastTime,
+                mImportantNoticePreferences.getLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE));
+
+        // Call {@link ImportantNoticeUtils#shouldShowImportantNotice(Context)} before timeout.
+        assertEquals("Current boolean before timeout 1", true,
+                ImportantNoticeUtils.shouldShowImportantNotice(getContext()));
+        assertEquals("Last version before timeout 1", 0,
+                ImportantNoticeUtils.getLastImportantNoticeVersion(getContext()));
+        assertEquals("Next version before timeout 1", 1,
+                ImportantNoticeUtils.getNextImportantNoticeVersion(getContext()));
+        assertEquals("Last time before timeout 1", (Long)lastTime,
+                mImportantNoticePreferences.getLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE));
+        assertEquals("Current title before timeout 1", false, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeTitle(getContext())));
+        assertEquals("Current contents before timeout 1", false, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeContents(getContext())));
+
+        sleep(TimeUnit.MILLISECONDS.toMillis(600));
+
+        // Call {@link ImportantNoticeUtils#shouldShowImportantNotice(Context)} before timeout
+        // again.
+        assertEquals("Current boolean before timeout 2", true,
+                ImportantNoticeUtils.shouldShowImportantNotice(getContext()));
+        assertEquals("Last version before timeout 2", 0,
+                ImportantNoticeUtils.getLastImportantNoticeVersion(getContext()));
+        assertEquals("Next version before timeout 2", 1,
+                ImportantNoticeUtils.getNextImportantNoticeVersion(getContext()));
+        assertEquals("Last time before timeout 2", (Long)lastTime,
+                mImportantNoticePreferences.getLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE));
+        assertEquals("Current title before timeout 2", false, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeTitle(getContext())));
+        assertEquals("Current contents before timeout 2", false, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeContents(getContext())));
+
+        sleep(TimeUnit.MILLISECONDS.toMillis(600));
+
+        // Call {@link ImportantNoticeUtils#shouldShowImportantNotice(Context)} after timeout.
+        assertEquals("Current boolean after timeout 1", false,
+                ImportantNoticeUtils.shouldShowImportantNotice(getContext()));
+        assertEquals("Last version after timeout 1", 1,
+                ImportantNoticeUtils.getLastImportantNoticeVersion(getContext()));
+        assertEquals("Next version after timeout 1", 2,
+                ImportantNoticeUtils.getNextImportantNoticeVersion(getContext()));
+        assertEquals("Last time aflter timeout 1", null,
+                mImportantNoticePreferences.getLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE));
+        assertEquals("Current title after timeout 1", true, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeTitle(getContext())));
+        assertEquals("Current contents after timeout 1", true, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeContents(getContext())));
+
+        sleep(TimeUnit.MILLISECONDS.toMillis(600));
+
+        // Call {@link ImportantNoticeUtils#shouldShowImportantNotice(Context)} after timeout again.
+        assertEquals("Current boolean after timeout 2", false,
+                ImportantNoticeUtils.shouldShowImportantNotice(getContext()));
+        assertEquals("Last version after timeout 2", 1,
+                ImportantNoticeUtils.getLastImportantNoticeVersion(getContext()));
+        assertEquals("Next version after timeout 2", 2,
+                ImportantNoticeUtils.getNextImportantNoticeVersion(getContext()));
+        assertEquals("Last time aflter timeout 2", null,
+                mImportantNoticePreferences.getLong(KEY_TIMESTAMP_OF_FIRST_IMPORTANT_NOTICE));
+        assertEquals("Current title after timeout 2", true, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeTitle(getContext())));
+        assertEquals("Current contents after timeout 2", true, TextUtils.isEmpty(
+                ImportantNoticeUtils.getNextImportantNoticeContents(getContext())));
+    }
+}