I am almost positive that a corpse's duration was variable by level, at least a little:
Quote:
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At low levels, possibly below level 10, corpses last for 30 minutes, and after that will decay. At higher levels, a corpse will not decay until 7 real life days have expired, and it will be rezzable for 3 playing hours.
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Source:
http://www.paullynch.org/Everquest/Death/
Also to confirm, the rez window is 3 hours of in-game time. If you log out of your account (not just your character), the timer was paused.