What is normal, sustained DPS at level 80?

[Alemi]

Ok, I'm theory crafting for Gluth 10 man, and the conclusion I reached was that if I just let the Zombie chow get eaten, I need to do 22880 (14805 if a healing debuff affects the 5% health regained) raid DPS to kill him before the enrage time. This puts me at about 3269 (2115) DPS for my straight DPS classes, and 1635 (1058 ) for my tanks. Is this possible, generally speaking? The numbers in parenthises are what I need to do in the case of wound poison/mortal Strike, which seem pretty handily obtainable. The original numbers seem a little more difficult to pull off.

Your math on raid dps is pretty sound, except that healing debuffs don't affect the heal from zombies since it's not a healing spell, it'd be considered a restorative effect. I'm pretty sure this was hotfixed back in 40 man naxx. However, I can hit over 3.7k, consistently, on my 4 dps shamans on Patchwerk, so that's possible - if you're proposing to turn Gluth into a tank and burn. It depends on the level of gear, if you're hit capped, and what kind of raid buffs you're getting. But, not to rain on the parade, to give you a kind of idea, the best Patchwerk kill with the group I normally run with was 3minutes3seconds. That's raid dps of 23,606. To even think that we could maintain that dps over 8 straight minutes, is pretty laughable. On a short burst fight, yes, on Gluth, highly unlikley.

Point being, unless you've gotten the <Make Quick Werk of Him> achievement or come even remotely close, I don't think this is likely.