Depends on how good the group you're with is, and how long you want to beat your head against a wall if they're not up to snuff. A good group in WotLK expac could run through Icecrown in about 5 hours. A bad group would be sitting at Saurfang for 3 hours before people gets tired of things and quit. However, this is done on a weekly basis, so 1 hour per day, not counting group assembly time, is about right. For this? I'd expect it to be spammable, or on 24 hour cooldown at most.
XI Wiki


