[Dan Carey]

I usually get a new guitar set up (if it needs it) about six to eight weeks after I receive it.
Here in New England, it's been my experience that, if I buy a new guitar and have a setup, it often needs a minor tweak during the first major seasonal change...Summer to Winter or the opposite. Then it's usually two or more years before it needs any other work at all.
That's with all of my smaller bodied guitars. When I owned my Lowden O-12, it would need a 1/8th turn of the truss rod for every major seasonal change. I figured that it was just because of the jumbo body that this seasonal tweak was necessary.

I humidify when it's dry and run air conditioning in the Summer, trying to keep the RH in my home between50% - 60%.

My guitars rarely leave the house and they have regular string changes.

So far, that combination has worked well for me.