I looked through most of these and may have over looked a reply on the whole item decay thing, but I know on live you had plenty of time to camp out and load up a different toon and turn in the last item for a quest, so like 1 min for that. I also know this works even if the toon finishing the quest was camped a few zones away, which could be from 5-10 mins.
Anything past a 10 minute limit I can neither confirm nor deny
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