It all depends on how old someone is and how long someone has run gear. For you at 29, in another few years, you'll qualify for legit HRT. You can stay on long term, using HRT doses, as long as you check your labs. I would suggest labs every 3 months for an HRT pateint, making sure that cholesterol, liver, kidney and red blood are all good. You've been on more than not and it's going to be hard to regain a good normal test level without some sort of assistance, be it through HRT dosing of test or long term clomid and HCG. For the guys that do want to maintain normal function, time off for at least as long as you spend on, plus PCT is a good rule to follow and always make sure that test levels are normal before you start back up.