To time something using the stopwatch:
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To launch the app, select Start and select Alarms & Clock from the app list or type its name into the search box.
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Select Stopwatch, and then Start.
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To mark a lap or split as the stopwatch runs, select Laps/Splits (the flag).
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Select Expand to increase the size of the stopwatch display at any time.
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Select Pause to stop the clock.
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Select Reset to clear the clock.