I stay out until one (or all three) conditions are met:
- Fuel enough to get me home with a couple of hundred miles range left in reserve.
- No torpedoes left.
- Two months at sea. While this isn't reflected in the game, I do it for role play/immersion because that was the realistic amount of time the men could handle before they started going squirrely and efficiency drops like a rock. I often make refuelling stops, but I cap it at 2 months.
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"Turning enemy ships into marine habitat since 1986!"
Mods Loaded:TMO 2.2, RSRDC, MaxOptics, Strategic Map Symbols, Stop The Shouting 
OR:
RFB, RSRDC, Maxoptics, SCAF, Strategic Map Symbols and the sanity-saving "stop the shouting".
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