It all depends on if recovery is important to you. If recovering your natural production is not an issue, I would get labs done after 8 wks off cycle. If your organs are all healthy, you’re ready to start the next cycle. If recovering your natural test is important, the old school formula is time on plus PCT equals the amount of time you take off, but the only way you can know for sure is to get your test and free test levels checked before and after your cycles