Hi all, I am looking for good spots while leveling 5 mages to use the Elixir of the rapid mind Horde side.

https://www.wowhead.com/item=128312/...the-rapid-mind

So far the only tip I am aware of is, amass as many quests as I can in 1 zone and then activate the buff and turn them all in, is there a good zone for this? or does anyone have any better tips as most online are for solo.