diff --git a/update_attempter.cc b/update_attempter.cc
index 7c32475..5b7f988 100644
--- a/update_attempter.cc
+++ b/update_attempter.cc
@@ -472,7 +472,7 @@
     LOG(ERROR) << "Process priority timeout source hasn't been destroyed.";
     CleanupPriorityManagement();
   }
-  const int kPriorityTimeout = 10 * 60;  // 10 minutes
+  const int kPriorityTimeout = 2 * 60 * 60;  // 2 hours
   manage_priority_source_ = g_timeout_source_new_seconds(kPriorityTimeout);
   g_source_set_callback(manage_priority_source_,
                         StaticManagePriorityCallback,
@@ -495,16 +495,9 @@
 }
 
 bool UpdateAttempter::ManagePriorityCallback() {
-  // If the current process priority is below normal, set it to normal
-  // and let GLib invoke this callback again.
-  if (utils::ComparePriorities(priority_, utils::kProcessPriorityNormal) < 0) {
-    SetPriority(utils::kProcessPriorityNormal);
-    return true;
-  }
-  // Set the priority to high and let GLib destroy the timeout source.
-  SetPriority(utils::kProcessPriorityHigh);
+  SetPriority(utils::kProcessPriorityNormal);
   manage_priority_source_ = NULL;
-  return false;
+  return false;  // Destroy the timeout source.
 }
 
 void UpdateAttempter::DisableDeltaUpdateIfNeeded() {
diff --git a/update_attempter.h b/update_attempter.h
index db05c7b..3a4ff49 100644
--- a/update_attempter.h
+++ b/update_attempter.h
@@ -134,18 +134,15 @@
   // returns.
   void SetPriority(utils::ProcessPriority priority);
 
-  // Set the process priority to low and sets up timeout events to increase the
-  // priority gradually to high.
+  // Sets the process priority to low and sets up timeout events to increase it.
   void SetupPriorityManagement();
 
   // Resets the process priority to normal and destroys any scheduled timeout
   // sources.
   void CleanupPriorityManagement();
 
-  // The process priority timeout source callback increases the current priority
-  // by one step (low goes to normal, normal goes to high). Returns true if the
-  // callback must be invoked again after a timeout, or false if GLib can
-  // destroy this timeout source.
+  // The process priority timeout source callback sets the current priority to
+  // normal. Returns false so that GLib destroys the timeout source.
   static gboolean StaticManagePriorityCallback(gpointer data);
   bool ManagePriorityCallback();