You can put it on group loot, and pass on your main. Greens/blues/epics will cause sparkle corpses. One of your 'slaves' needs to not pass, and roll on items. Never bothered to try it with masterloot though.
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With my Dk and Rets the Most it takes for an instance is 20 min most take 15 min or less Id say i knock out between 3-4 an hour.
My DK & 4x rets can blow through instances really quick - 0 down time.
It takes a lot longer for the shamans, they have to stop, put down totems etc... Then you have to go pick them up, drink at times.