Not sure of the exact length of time
I know in the Indian Ocean it was around 55 days inbetween as there were no real dockyard facilities available for the German subs and the Japs never went out of the way to help
In German ports it would depend on all sorts of things
Damage
Need for upgrades
Crew leave and replacement
Availabilty of parts
How many boats were in front of you when you docked
Dont think there was ever a set time
28 days seems a good figure as used ingame
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