it really does depend on the kind of ASS during the cycle tho. an 8 week prop or fina cycle could theoretically be repeated in as little as 3-4 weeks since clomid therapy could be initiated within 3-4 days after ur last injection. long acting esters require 3 weeks or so to clear after which therapy must begin making it a manditory 6-7 weeks. so u can see that it really has to do with your ASS taken.
This stated, i feel that a further period of rest than is actually required is beneficial as it gives the body time to better adjust to the new mass. sure the muscles have grown but its best to give the joints and connective tissues more time to recuperate from the heavy training cycle that was undoubtably undertaken while "on". - this can help keep u from injuries IMO.