Hi @Nikola,
I've probably made mental note of this especially since it corresponds to my own experience, but I've seen many report extending remissions as their decades with CH hurl by.
In fact for nearly a couple decades, remissions between my bouts with episodic CH (which started around 1980) were ever-increasing in length, something I imagined that if I'd kept track, those extensions might have correlated to some sort of Fibonacci number series. The bouts themselves extended also though, increasing in length from a couple weeks to 2.5 months, and at some point the attacks increased in severity, with the individual attacks going on as long as 3 hours, compared to maybe 20 minutes or so with my very first inaugural attacks. This increased-severity deal could have been spurred by one truly honking drug cocktail I was prescribed at a point, though imitrex, the most oft-accused drug for causing such issues, wasn't even available then.
I still find myself with nice longgg remissions, but not predictably ever lengthening - I've had shorter ones following longer ones, so no pattern anymore.
The blue 'New Users Read Here First' banner up top of the page here ^^^^^ provides introduction to the manner in which many of us have successfully thwarted the Cluster Bunny when it comes a 'knockin, and the Basic non-busting information is good too: