How to change the screen timeout duration on my BlackBerry Bold 9900 4G

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You can decrease the amount of time taken for the backlight to turn off when the BlackBerry® smartphone is not being used. A shorter timeout can help preserve the 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.