Coldain Ring
 

How far can a 60 shaman with torpor get? Is it possible to solo all the way up to ring # 9?

Thanks

1-7 should probably be doable, though 7 would be rough due to the number of adds.
8, you'll want help from some one with harmony or who can split pull quickly for you - you also have to kill the chief pretty fast to avoid doing the full battle, so root rot alone might not be enough dps. Pretty easily duo'd with a druid.
9, you would probably run into some trouble on a few parts. Some of it would be soloable but other parts (like plate cycle and councilor juliash) would not be.

Tldr; 1- 6 yes, 7 probably, 8 probably not but maybe, 9 mostly not.

7 is easy, you just train stuff to dwarves and let them pick em off one by one. Just don't kill your quest npc.