Hello Steve and jimbuna!
First source I found quicly is Clay Blair. In his "Hitler's U-boat War. The Hunters, 1939 - 1942" Blair writes:
Quote:
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Dönitz went to sea on one duck or the other. He was a demanding but fair forgiving instructor(...) Dönitz put the ducks through a variety of drills but the main emphasis was on torpedo shooting. Every duck in the flotilla was required to carry out sixty-six daylight submerged and sixty-six night surface attacks(...)
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Modern Library Paperback Edition, 2000. Page 41.
I have seen the same thing mentioned at least in one or two other sources, but Blair was "in hand" just now.
Greetings,
-RC-