Gurubashi Arena Master

Just so everyone doesnt wait around all day, these events happen every 3 hours. 3am, 6am, 9am, noon, 3pm, 6pm, 9pm, midnight

Short John Mithril will normally do his call-out at 00:00, 03:00, 06:00, 09:00, 12:00, 15:00, and 18:00 server time. However, because of the fact that the Gurubashi Arena Booty Run is set every three hours instead of at certain times (the server does not check the time, it simply counts out 3 hours), during Daylight Savings Time, the chest will not spawn at the normal time, but either an hour later or an hour earlier than usual, until the following Tuesday when maintenance is performed and servers are restarted.

Taken from WoWPedia.

So we had an... interesting fight the other day, some 8 players fighting persistently for about 10-12 minutes. Then all of a sudden the chest despawned and everyone wondered who had won.

Never heard about a despawn time on that thing. Can someone confirm this?