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Interesting question...most people would wonder about the RESPAWN time instead of despawn time. I think the time may vary slightly depending on the number of items in the chest. But once opened if you do not remove the items from the chest, you probably have approximately a minute before the coffer or chest disappears.

But that is a GUESS. I can't find any reference material on it and I'm too greedy in game to let an open chest just disappear to time it....sorry. Skyfiredancer (talk) 10:26, August 2, 2015 (UTC)