The time on equals time off thing is from when guys would pct so it's just be ingrained and parroted on forums for years so, it's just one of the things that used to be applicable but, these days, guys just don't want to run a PCT.
If you're going to PCT, it's still the best approach though
In terms of guys like yourself, there's just as much nuance with the time between cycles though. How your markers before the cycle, during the cycle, at the end of the cycle, after the prescribed time off. The first two are overlooked and they're the most important IMO. Some guys have awful bloods while they're on but recover quickly. Does that mean they've been 'off' long enough because things "look good" 6 weeks post? I would say no.
How does someone respond to gear health wise and progress wise. I've been able to run stupid doses with no impact on my bloodwork (only 1 time it got out of hand) but, I also don't see the dramatic improvements a lot see from gear itself. So for me, in the past, I've had to really push doses to get "acceptable progress " and 6 weeks after the cycle, blood work looks good.... Should I start another cycle if I came off 2g test, 700mg tren, 500mg Deca, 50 units of lantus, 8iu GH, whatever orals I had in there for 20 weeks? No, probably not.
It's just so person dependent there's no "best answer" but, time on vs time off is usually a very acceptable place to start, especially if someone is asking how long they should wait.