This question was lengthily debated in SH3. The consensus was that 28 days in base were the standard for time between patrols.
Of course, adding or upgrading an equipment would extend that time.
But what really impacted that time was the repair time of a damaged sub. You could add one or two days per percent of hull damage.
As an exemple, you return home with a 85% hull integrity, you would have to wait roughly one month and a half before being able to go on patrol again.
In the early time of war. Past winter 42-43 it would have been two months.
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