Well there is a little mod called WB's Mid Patrol Radio Orders. It sends new orders when you're on patrol, but this is just for immersion. You don't get any renown or anything by following them.
My advice: when you're done patrolling your grid, just seek out another one. Keep going until you're either out of torpedoes or out of fuel. That's what was expected in real life from u-boat commanders as well. Most patrols would last for anything between 25 or 35 days. The longest one lasted 225 (!) days. Though I guess they refueled at sea for that one.
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