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Have you overcooked something? Not if you have a good timer to warn you:
Select Clock from the Home screen.
Press the Menu key and then select Timer.
A screen similar to the left side of Figure 6-7 appears. The left button with the stopwatch image is the start and pause button. You can use the right one with the circular arrow image to stop and reset the timer. The default time for your timer is based on what you set earlier. If you haven't set a time, proceed to the next step.
Press the Menu key and then select Set Timer.
A screen similar to the right side of Figure 6-7 appears.
Enter the time.
You can either enter the time with numeric keys or scroll up or down to choose from provided values.
From left to right, the time component is based on hours, minutes, and seconds. Scroll sideways to choose the time component.
Select Start.
Your timer starts ticking. Once it reaches the time, it will notify you.