[PantherPrincess]

I don't think it would take that long at all. If you choose to not Charge Mind and go straight into HSDW and chanting that's only 2 rounds to pull it off like Chaos said, you'd cast the invocation at the end of the 2nd round. If you choose to Charge Mind then that's 3 rounds to deal with. It's a fair trade off for attempting to nuke the whole field, it gives people a window to actually do something against you. Now that invocations can't be washed away that's even more of a plus. There's a lot of anti silence measures you can even go with to ensure you pull it off (heron feather, silent prayer, gentle embers, or insane status resist just to name a couple). Also there's Lazarus Wind helping you if they come up in your face.