Yeah did the whole war by being REAL conservative averaged 10 - 20000 tons a patrol. Avoided aircraft and large convoys.
Started with U32 a type VII, got U123 a Type IXB, then U156 a Type IXC then U181 a Type IXD2.
I start with the 2nd flotilla in Wilhemshaven, get transferred to Lorient, then request a transfer to the 7th/13th in July of '44 to Trondheim, otherwise you get sent to Penang.
I ended the war sailing into Cruxhaven or Bremen.
The highlight of my career - being in SW corner of AM12 on May 21st 1941 and sinking Hood and Prince of Wales.