You can find out how many rounds in any semi auto it will fire before cleaning and that is to shoot it until you get misfires. I think most 22 rifles will go around 500 rounds depending on brand of ammo and it appears my colt 22 pistols don’t make it that long before misfires, but they are easier to clean just by locking back the slide and cleaning the breech, feed ramp and bolt face with a toothbrush and solvent. 22 semi rifles need the trigger group cleaned as well. 22 revolvers are not immune as the chambers get crud rings that don’t allow the cartridge to fully seat which softens the hammer blow and eventual misfires. Lever, pump and bolt rifles seem to shoot forever with little issues.