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FilledSmallSquareSessionTime[ ] gives the total number of seconds of real time that have elapsed since the beginning of your Mathematica session.

FilledSmallSquareSessionTime starts counting time as soon as your operating system considers your Mathematica process to be executing.

FilledSmallSquareSessionTime is accurate only down to a granularity of at least $TimeUnit seconds.

FilledSmallSquare See The Mathematica Book: Section 2.13.3.

FilledSmallSquare See also: TimeUsed, AbsoluteTime, Date.