If you set your speed to 7 knots, you'll have roughly 13000 km of autonomy with a VII sub. I've been able to do Wilhelmshaven - Freeport -Wilhelmshaven plus some convoy huntings without intermediate pitstop at this pace.
Welcome onboard Kaleun 
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GWX3.0, patched OLC Gold, Torpedo Damage Final 2, Debris & Lifeboats v4, SH3 Commander 3.2
100% realism, no map updates
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