I change the watch myself. Unless attacking, being attacked and bad weather, I change the watch every 12 hours. I make it a point to keep as many rested as possible. Stress has a negative effect on endurance. Also in bad weather going under and traveling slow has a positive effect.
I find standard speed and 1\3 speed the best to save fuel.
Good hunting.
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"Noch und Noch"
Prowling the Nord Atlantik with GWX 3.0.
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