Just a few years in my case. When I got serious about hunting I wanted to use premium bullets. My brother had a single stage RCBS kit laying around that he had quit using, too tedious for him. We made a deal I would load his hunting rounds for him if he gave it too me. That was 30+ yrs ago and I'm still using it for rifle & pistol ammo. He doesn't shoot much at all, maybe 3-5 shots a year. Me, I shoot apx 500 rnds a month of handgun & 20+ rifle a year, depends on how good the hunting is that year.
Not only do I save a fair amount of cash but I enjoy the process and shoot high quality ammo. I feel you get a better reload with a single stage.
I prefere quality over quantity.