Many things contribute to a tired crew:
o Battle Stations active too long
o Damage control active too long
o Cruising on the surface in winds over 8 m/sec for extended periods. Note: if you have waves crashing against or over the bridge, give your crew a rest at PD for a few hours. If really tired you may need a day or two. At 15 m/sec or more, I just stay under and only come up for recharge every 30 hours or so.
o Extended patrols without returning to base.
o Failure of the captain to cycle more alert crew members into important positions when in enemy patrolled waters or in combat.
o Failure of the captain to purchase better qualified crew and cycle out dead beats at base.
o Failure to realize your first crew is green and will not always perform 100%. It takes nearly the whole war before you get a crew that has full capability.
Summary:
In the early war you are leveraging your green crew and dud torpedoes against an inexperienced IJN and a target rich free-for-all in some areas. Also working against you is the weather and the vast distances. You have to be very aggressive so you can expend your torps and return to base before your crew tires out. You also need those sinking renouns to get better crew and equipment to compete against the better crew and equipment being given the enemy by the game as the war progresses.
Later in the war you have very good crew and equipment with many refuel/weapon-load bases but the target densitiy drops dramatically forcing longer patrols (which your crew can now handle because you've carefully built them up.) The destroyers and aircraft are on average more leathal by this time.
-Pv-
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