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FilledSmallSquare$TimeUnit gives the minimum time interval in seconds recorded on your computer system.

FilledSmallSquare On many systems $TimeUnit is equal to 1/60.

FilledSmallSquare$TimeUnit determines the minimum granularity of measurement in functions like Timing and Date.

FilledSmallSquare In some functions the actual time granularity may be larger than $TimeUnit.

FilledSmallSquare See The Mathematica Book: Section 2.13.3.

Further Examples