Tours of duty (7)

I think it could be either:

Which length description are you looking for?:

stints

'tours of duty' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for stints that I've seen before include "Stretches" , "Spells" , "Allots sparingly" , "Unbroken periods of work" , "Allotted work periods" .)

I've seen this clue in the LA Times, the Newsday and the Universal.

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