Check it next time you're about to go to the range to see if it needs additional lube. My guess is that it will not. As for lint it depends on how you carry, though I don't IWB my P3AT but my guess is it would gather less lint and such as compared to my front pocket carry. You of course must decide for yourself but I would have no concern going 2-3 weeks without re-lubing. More often certainly wouldn't hurt and I often will clean, lube and grease mine within 2 weeks of the last maintenance.