There have been those who have timed the passage of day and night in "real time" and determined an interval. Unfortunately, I've forgotten what it is. I think it's variable, because moving around makes time pass faster than just standing still and doing nothing. Time passes even faster in a battle, and also passes fairly rapidly when talking to an NPC. So it does seem to be variable. However, what Moni said is actually a danged good rule of thumb. I've found that if I enter a dungeon around sundown, and adventure until my inventories get full, I exit right about dawn.
Good call, Moni!
-Sazerac
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