My Tip is: if you are creating another group and you have 60 toon(dk or another(grant to level), rush thru east DM, you can run with 60 toon and the others healing in 15 to 20 min, and if you just wanna train mining or farm thorium with your 80 that can go down to 7 to 10 min. At the end of the instance you will have 2-3 rich thorium nodes and a bunch herbs thru the instance.

PS: Sorry about the grammar english not my first language :P