For me it depends on how successful or damaged my boat gets, if im out of torps and deck ammo (which happens less and less now since almost all merchants are armed mid 40..?) I'll RTB and end patrol, refitting seems to not count towards adding to any objectives, I don't know why.
A typical patrol is about 1 month, and I usually end up in the western approaches area south of Iceland, where I havent yet nailed down the convoy schedules yet.
If you do a few good patrols ~50k GRT, then you should get offered new commands.
I think this Kaleun went from the starter VIIA (u-21), to a VIIB (U-47, and yes I took her into Scapa!) by Jan 40, and I kept the VIIB for a while and turned down the first VIIC offered by accident, eventually I was offered another one around Aug 40 and now I'm floating about in U-69.
Eventually you will get a new VII either before or after the transition to France.
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