I would assume the best thing to do is wait till your body is clean and fully recovered from a cycle.. and i'd go further to say that everybody is different in how long it takes to recover, even from identical cycles. I do like the time on/time off idea for a starting point though
I agree...the general rule is Time on=Time off. But that's the starting point. I think the best way is first fully recover from any side, then let your body get clean and used to be natty again. Then you can start a new cycle.
There's only one situation where someone shouldn't heed the time on = time off creed. If someone gets their bloodwork done and they're fully recovered in 6 weeks then go for it. I bet less than 5% of the people here get bloodwork.