Short answer- I do it whenever it needs it. Longer answer- All of my guitars are different. My gig acoustic has a five piece laminated neck (lengthwise) and that guitar is ridiculously stable. It does not move. Crazy humid summer, super dry winter in the forced air heat, it just doesn’t move at all. I adjusted it just a tiny tweak when I got it about two years ago. Haven’t touched it since. My LTD... neck thru. Mahogany neck and body. That thing needs adjusted every time the wind changes direction. If I’m standing by the door of the bar during a gig and it’s drastically hotter or colder outside than it is inside, the guitar goes horrifically out of tune every time somebody opens the door. It’s a total rubber neck. I’ve had this issue with a LOT of inexpensive, imported set neck and neck-thru guitars. Not really ever with a domestic one... Really I adjust it when I feel it’s a little “off”. If I’m getting some fret buzz, or if it feels kinda high, I give it a look. If it looks off, I tweak it.