The corpse decay time is 10 minutes, I believe. That's gamewide as long as the corpse has something on it and isn't a player's corpse.
An average respawn time is 10 minutes and 40 seconds for that spawngroup, if I read it right.
Pretty much, the idea is to just keep from having the corpse and the creature up at the same time, so, however you solve that... -shrugs-
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