PCT is run in attempt to kick your normal homrone production back in gear. I would opin that there is not a person who has ever run gear who has had normal levels after 4 weeks of pct. By the end of pct, you hope that you have given your endocrine system the right amount of help so that it can do the rest on its own.
If you jump right back one, why would you even run post cycle therapy (pct)? Why not just stay on?
It takes me approx 5 weeks to notice any of the sides from deca. It takes a couple of weeks to notice anything from test e. So you go off...run post cycle therapy (pct) for four weeks, then jump back on. You take 3-4 weeks for your new course of drugs to actually be helping you at full force. In the interim, you have pissed away 3 weeks waiting for pct...4 weeks of pct...and 4 weeks of build up. That's 11 weeks.
Instead of jumping back on, just run the cycle a little longer next time.
I do not advocate jumping back on immediately following pct. Your hormone levels will still be fluctuating. Your endocrine system will be one confused bunch of crazed organs for sure.
Time on =time off is just a rule of thumb. It's a good idea, but I don't think it is necessary. I do think staying off for a few months in order to get everything back to normal certainly is the thing to do though.