Guten Tag,
A cursory random sampling of Type VII patrols indicates to me a tendency towards 30-40 day patrols, with a peak range of 70-100 days (90+ days definitely in the minority).
No question, Type VII boats could carry provisions for up to 3 months, but most came home sooner than that, even empty-handed. I would factor in the stress on the crew, esp. under harsh conditions (which could also affect the boat's mechanical performance).
Tschuss!
__________________
Dietrich Schöneboom, U-431
"Es wird klappen, Herr Kaleun. Ganz sicher."
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