If he is shedding how long will it take?
With good waterflow on the coral it shouldn't take more than 5-7 days. You should also inspect the coral closely for any necrotic ares (in leathers it is usually a very white are where the flesh crumbles off. FWIW
, I have had toadstools that went dormant for months after a lighting upgrade and never opened up, until I fragged it.