how do i increase or decrease the backlight timeout?

1. From the Home screen, tap All apps.
2. Tap Settings.
3. Tap Display & gestures.
4. Tap Sleep.
5. Tap a duration:

• 15 seconds.
• 30 seconds.
• 45 seconds.
• 1 minute.
• 2 minutes.
• 10 minutes.
• Never turn off.

NOTE: Setting a longer backlight timeout may shorten the handset's battery life. See the Power and Battery category for tips to optimize your battery life.

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