Funny how during my recent visit to the old country the idea of the frequency of future visits evolved.
Before going there I only intended to repeat it every several years. But I felt it polite to pretend to my relatives I expected to come back every other year; somehow I got subconsciously accustomed to the notion. And after leaving my last best friend I seriously considered returning every single year, just for the sake of meeting him again.
That was probably no more than a consequence of the mood of the moment though. Pondering it soberly again, every few years would possibly be the best solution.