As Mookie pointed out, The Daily Trim Dive.
They also had to carry out The Daily Routine (maintenance on all internal torpedoes, including those in tubes).
Figure on being submerged at least 4 hours daily.
The most dangerouse times to be on the surface are:
2 hours prior to sunrise til 2 hours after sunrise.
2 hours prior to sunset til 2 hours after sunset.
(Especialy if your heading into the sun).
That should provide your hydrophone operator more than ample time.
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