Running a reallocate after disk shelf add

I added a disk shelf and expanded a data aggregate.  Running a reallocate start -f  -p /vol/vol01. It is running but I would like to 

quiesce and restart at a later time. Ran reallocate quiesce /vol/vol01.  The command ran and did not return anything.  Its been a few hours and the it still shows a status of Running after running reallocate status -instance.  Does it significant time to quiesce? What should I expect at this point? The reason I am trying to quiesce is to delete some volume snapshots in an attempt to speed up the reallocate. How do you suggest I proceed?

Thanks-