In game, its about 12h from 50% to 99.999999999999%. There is a bug, and the batteries wont recharge fully, so you have to manualy click onto the "normal propulsion" button, so that you can get full power from the engines. Also the snorchel radar doesnt work, you keep getting "Radar destroyed" message, when you start a patrol. The boat would be really good without those bugs, but now it just isnt. Also, I play at 94% difficulty, and I was really looking forward to this boat, when I started my second career in 39 (Ive succesfully finished my first one, which I started in 1940), but then I was dissapointed with this small, but at the same time, if you play without the external camera, very big bugs.
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