It takes me 3 weeks after PCT before I feel 100% normal. Then I want my body to stay that way for a little while before jumping right back into a cycle so I say 2 months off (after PCT) is a good rule of thumb.
This can be tough to do since you get used to feeling like superman on-cycle and once that's over you want it back as soon as possible. But, not leaving enough time for your body to recover between cycles is asking for trouble. Ultimately you'll take longer and longer to recover; you'll grow imapatient and start another cycle because you can't recover; and eventually end up on HRT.