Use the stopwatch to time something.
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Select Start and select Clock from the app list or type its name into the search box.
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Select Stopwatch (if necessary, select Toggle navigation to open the menu first) and then select Start .
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To mark a lap or split as the stopwatch runs, select Laps / Splits (the flag, ❶ in the image below).
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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 (the circular arrow, ❷ in the image above) to clear the clock.