Ok, here is from Wikipedia:
Quote:
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They could travel submerged at about five knots (9 km/h) for two or three days before recharging the batteries, which took less than five hours on the snorkel.
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http://en.wikipedia.org/wiki/Type_XXI_U-boat
http://www.worldhistory.com/wiki/T/Type-XXI-U-boat.htm
http://www.brainyencyclopedia.com/en...xi_u_boat.html
http://www.ebroadcast.com.au/lookup/...XI_U-boat.html
http://www.battle-fleet.com/pw/his/uboat20.htm
With all these sources, and I'm sure more are out there, I am pretty sure it was only 3-5 hours for a full recharges. That's one of the things why XXI was so revolutionary. Now, about those airplanes... :rotfl: :rotfl: :rotfl: