The whole time on/time off thing is just a made up hypothesis with no real validity. Even if your T levels are back to normal, the HPTA is still recovering for weeks afterward.
These days you can recover faster and better than ever using certain substances and not relying on stuff like nolvadex. (Which really does nothing to restore HPTA function.) Still, if you go back on too soon, too many times , you may be working at less than 100% efficiency.
If you cycle for more than 10 weeks, more than 4 times a year, it's safe to say that after a couple of years your HPTA will never be what it was. This is why you have guys going on HRT at age 35 and younger. I didn't need HRT until I was 47.
Also, with products like BRIDGE you can make excellent gains while off.
Guys who do shorter less frequent cycles always seem to look better than the guys who rely on the stuff non stop. And of course, those guys can never go natty because they'll lose everything.