AbsoluteTiming
 Usage
• AbsoluteTiming[expr] evaluates expr, returning a list of the absolute time that has elapsed, together with the result obtained.
Notes
• AbsoluteTiming gives the absolute number of seconds of real time that have elapsed, multiplied by the symbol Second. • AbsoluteTiming has attribute HoldAll. • AbsoluteTiming[expr;] will give {timing, Null}. • First[AbsoluteTiming[expr;]] /. Second->1 yields just the number of seconds of time elapsed in the evaluation of expr. • AbsoluteTiming is always accurate down to a granularity of $TimeUnit seconds, but on many systems is much more accurate. • New in Version 5.
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