If the second hand is on a number, you multiply that number by five, and that's the number of seconds. If it's on one of the little marks between numbers, multiply the number it was on most recently by five, then add the number of marks it's passed between the last and next numbers.
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its least count will be one second
one second
the second hand
The second hand on the clock circles 420 times in 7 hours.
Because it counts seconds.