A lot of factors go into this bro.

1, How well do you recover?

2, What compoinds are you using?

3, What kind of doses you are taking. 

4. how long is your cycle? 

But really, 2, 3  and 4 come back to 1. Some drugs like deca or tren can be harder to recover from. The higher the doses, the harder it can be to recover. And of course, the longer you are on, the longer it will take to recover. Plus, when we talk about recovery, we dont only want to address recovery of natural test production. We also want to talk about organ and blood health. Some compounds, especially orals, will raise your liver lab readings in the "high" range and jack your cholesterol up. 

So when will you have recovered from a cycle? The only way to know is to get labs done. Then you'll know you're good to go! The rule of thumb is usually time on cycle should equal time off plus PCT. So looking at the math, I think that you are right. If you are to run shorter, 8 wk cycles, you might be able to squeeze in 3 8 wk cycles. Or 2 longer ones.