How to change the screen timeout duration on my BlackBerry Bold 9790

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You can set the amount of time taken for the backlight to turn off when the BlackBerry® smartphone isn't being used. A shorter timeout can help preserve battery life.
1. Scroll to and select All.
2. Scroll to and select Options.
3. Scroll to and select Display.
4. Scroll to and select Screen Display.
5. Scroll to and select Backlight Timeout.
6. Scroll to and select the required setting (e.g. 45 Sec.).
7. Press the Menu key.
8. Scroll to and select Save.