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TimeConstrained

TimeConstrained[expr, t]
evaluates expr, stopping after t seconds.

TimeConstrained[expr, t, failexpr]
returns failexpr if the time constraint is not met.

TimeConstrained generates an interrupt to abort the evaluation of expr if the evaluation is not completed within the specified time.

TimeConstrained returns $Aborted if the evaluation is aborted and no failexpr is specified.

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

Aborts generated by TimeConstrained are treated just like those generated by Abort, and can thus be overruled by AbortProtect.

TimeConstrained may give different results on different occasions within a single session, for example as a result of different conditions of internal system caches.

TimeConstrained takes account only of CPU time spent inside the main Mathematica kernel process; it does not include additional threads or processes.