It takes forever to get to my patrol area, but in areas that I know are trafficed, I'm usually submerged all the time, only surfacing at night to recharge the batteries. Staying submerged most of the time will really slow down the trip but will cut down your chances of missing nearby targets.
If I run into a single ship, I have no problem taking it out in daylight. When I find a convoy, I usually shadow it and wait for night to make my attack.
There's no real formula. You just do what works for you.
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