Sailor Steve is right.
Cruising speed for a Type IIA should be 1/3 speed, which is about 7 knots in calm seas, 6 knots in heavy seas.
Once in the patrol area, I cruise submerged in daylight at slow speed, which allows for hydrophone searching, then recharge the batteries on the surface at night also at slow speed.
Using this method, a Type II can even reach Scapa Flow from Kiel, patrol for a couple of days then return to base. You should be able to stay at sea for 14 days that way.
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