I agree with this. It's taken me forever with Stone Vigil. First group ran out of time (kept wiping on second boss), second group the tank dc'd and we tried to wait to see if one would queue in- no luck, third group kept wiping on second boss and ran out of time, and finally beat it with my 4th group- WITH 38 SECONDS LEFT!!!

I was tearing my hair out haha. The timer wasn't really an issue for previous dungeons, but unless you've done Stone Vigil before, you're racing the clock even with little to no wipes.