That's a difficult question to answer. The U-boats were beaten war horses. Every encounter, call for full speed ahead, and emergency dive wore down these boats in some kind of way. The hull of these boats were stressed constantly and would have a fracture every now and then. There was no definite answer, because it depended on the tender loving care needed to keep these boats going.
U-333 had so much damage it took over 6 months to get her sea worthy again. In those cases, crews would receive extra training. I keep this option random for the realism of these matters.
Also every new piece of equipment you upgrade takes longer as well.
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