4-5 hours on a stir plate is pretty good. Presuming your yeast vial is reasonably fresh, you can often be at or near high krausen in 4-5 hours on a stir plate, and pitching at high krausen is typically a good thing. I don't think it's necessary -- if you're really tight on time you'll be fine if you don't do a starter. But it can't hurt & could help to make a starter, even for 4-5 hours, so if you've got the time . . .
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