Mine go long periods without cleaning or much more than a dusting off with a toothbrush. Many I'm sure would consider it abuse. OK. My using guns are carried daily and have always worked when I needed them, even when "neglected" for long periods of carry. Reading of the 2000 rd challenge, and other carry/cleaning habits of some more experienced shooters than me have given me renewed confidence in my guns and my ability to largely ignore them (slightly overstated). I handle the carry guns regularly, but they dont get much "care" attention. They are mostly dry on the outside, its REALLY dry and dusty where I live. If they get dirty enough to make me worry about function, I'll clean and/or oil them. Most of them live in holsters full time and most have been loaded for as long as I've owned them (not the same rounds). If my guns get rained on, they get dried off with whatevers handy, paper towel, t-shirt, etc to dry them, and largely left alone. Theres rarely any rust. Once in a while a spot shows up in the crevice between the barrel and mag tube on lever actions or on a Smith revolver. Its just cosmetic.
Time periods? Revolvers, maybe actually formally cleaned once a year. Autos, maybe cleaned if I shoot them much, or top taken off, wiped and toothbrushed out, re-oiled and put back together. That happens 2 or 3 times a year maybe. Zero functional issues so far.