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TimeConstrained—Wolfram Language Documentation

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BUILT-IN SYMBOL

TimeConstrained[expr,t,failexpr]

returns failexpr if the time constraint is not met.

Details

TimeConstrained generates an interrupt to abort the evaluation of expr if the evaluation is not completed within the specified time.
TimeConstrained evaluates failexpr only if the evaluation is aborted.
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 can be overruled by AbortProtect. »
TimeConstrained[expr,Infinity] imposes no time constraint.
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 Wolfram Language kernel process; it does not include additional threads or processes.

Examplesopen allclose all Basic Examples (2)

Terminate a computation if it takes more than 1 second:

Terminate a computation if it takes more than 2 seconds:

With the default method, it gets a (not quite as accurate) solution within the time constraint:

Scope (2)

Specify the value to return if the time constraint is reached:

Use CheckAbort inside TimeConstrained to select which parts are skipped if the limit is reached:

Properties & Relations (5) Wolfram Research (1988), TimeConstrained, Wolfram Language function, https://reference.wolfram.com/language/ref/TimeConstrained.html (updated 2007). Text Wolfram Research (1988), TimeConstrained, Wolfram Language function, https://reference.wolfram.com/language/ref/TimeConstrained.html (updated 2007).CMS Wolfram Language. 1988. "TimeConstrained." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2007. https://reference.wolfram.com/language/ref/TimeConstrained.html.APA Wolfram Language. (1988). TimeConstrained. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TimeConstrained.htmlBibTeX @misc{reference.wolfram_2025_timeconstrained, author="Wolfram Research", title="{TimeConstrained}", year="2007", howpublished="\url{https://reference.wolfram.com/language/ref/TimeConstrained.html}", note=[Accessed: 12-July-2025 ]}BibLaTeX @online{reference.wolfram_2025_timeconstrained, organization={Wolfram Research}, title={TimeConstrained}, year={2007}, url={https://reference.wolfram.com/language/ref/TimeConstrained.html}, note=[Accessed: 12-July-2025 ]}

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