I find that I can play only an hour or so before I am fatigued.
Actually in game I manage my men as I enjoy managing all the boat activities - not something an exec. officer would do but it makes for more immersion. I am used to running crews and managing my guys in RL, so when ashore I like to keep that dynamic. Whatever floats your boat I say!
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html