While watching Burn After Reading Harry Pfarrer uses the following phrase at times when he's leaving a place:
Maybe I can get a run in
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In idiomatic U.S. English, a person who says, while leaving one location, "Maybe I can get a run in" is suggesting the possibility that he or she can find time for a brief run for exercise (what used to be called a jog) before the next item on the person's schedule must be attended to.
As that description suggests, the phrase often come up under unplanned circumstances—when, for example, a late morning meeting breaks up early and the person has time for a long lunch (or maybe a run and a quick lunch) before the scheduled slate of afternoon activities at work begin.
A fuller expression of the idea—though not a wording that someone would be likely to use, since the shorter idiomatic form is available—might be this:
Maybe I can get a quick run squeezed in among my other accomplishments for the day, if I do it sometime between now and when my next scheduled activity begins.