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That said, Zul Gurub is going away with the Shattering, which is rumored to be happening tomorrow or Tuesday. So if you want to know when you can do it again, the answer is probably never.
More generally, raids usually reset at 8:00 on Tuesday morning. There are one or two other raids that reset on a twice-weekly schedule, but I don't remember what they are. Once you're saved to a raid instance (happens when you kill a boss in the raid), there will be an entry on your calendar telling you when the raid lock resets.
Edited by Kadius on 11/21/2010 7:37 PM PST
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