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I'm trying to find such a word to describe the time peroid before a workflow/process should be completed.

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You might talk about the "execution phase" although technically the execution phase can extend past the deadline if the program slips schedule. – Jim Jul 3 '14 at 6:55
up vote 2 down vote accepted

From Oxford Dictionaries online...

lead time - the time between the initiation and completion of a production process

(Pronounced "leed", not "led", obviously!)

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Thanks, this is very close to what I want, only that lead time should better be applied in specific production process. Don't you think there is a word more general? – Yufeng Jul 3 '14 at 2:36
e.g. (1) Freshly elected politicians frequently forget to consider the amount of lead time required to get them re-elected on the next election cycle. (2) The lead time required to test and prep the software for general release date is about 6 weeks. – Blessed Geek Jul 3 '14 at 3:51
In US semiconductor fab and manufacturing, lead-time is a very important word in the process planning dept, due to parallel processes that has to occur and then concur at planned dates. – Blessed Geek Jul 3 '14 at 3:55
@Yufeng- For a more more general term it's simply time- as in, "You've still got time; it's not due 'til Thursday." – Jim Jul 3 '14 at 6:53
@Yufeng: As Blessed Geek's examples show, you're imposing an unnecessarily narrow definition on the word production. Native speakers are quite flexible about what "procedures intended to produce a result within a given timescale" can have a "lead time". – FumbleFingers Jul 3 '14 at 13:18

Perhaps the run-up

The period preceding a notable event: *an acrimonious run-up to legislative elections8

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Thanks, 'run-up' looks like the preparation peroid before some process actually starts. – Yufeng Jul 3 '14 at 2:33

I think you may be referring to the implementation period or process:

the act of implementing (providing a practical means for accomplishing something); carrying into effect.

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Here are two suggestions:

term -(archaic) A boundary or limit, especially of time.

In a not so ideal world, "window" would about do. It means an interval or opportunity for action.

Look these two up on Oxford.

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