All you need to keep your skills intact is about fifteen minutes and fifty rounds a week. This is the exact program I used when I was working patrol and then assigned to a specialized unit where my range time was limited. Now look, this isn’t going to get you better. It’s a pure sustainment program and is what I consider the bare minimum for anyone who carries a pistol professionally. If you added a couple of five-minute dry practice sessions per week, you’d be way ahead of the game, but hey…let’s not get all crazy here.