The stopwatch usually shows minutes, seconds and milliseconds until 1 hour, after which it shows hours, minutes and seconds.
After reaching 24 hours, many stopwatches start at zero, but some keep the hour-minute-second display instead of returning to minutes-seconds-milliseconds.
I can remember this from my childhood where I happened to test it.
The stopwatch usually shows minutes, seconds and milliseconds until 1 hour, after which it shows hours, minutes and seconds.
After reaching 24 hours, many stopwatches start at zero, but some keep the hour-minute-second display instead of returning to minutes-seconds-milliseconds.
I can remember this from my childhood where I happened to test it.
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