You can go as far as you want whenever you want until the chain breaks if that's your style. Then you can shorten it a link and go some more! Your chain may not last as long as a lubed chain but it's all about the ride isn't it? I used to tour with a guy who was always sprating water from his water bottle on his chain, pedals etc. to get rid of squeaks and we had many fun tours together. I was the nerd always fussing with my bike, he was the ape-mam always laughing and talking. It was a hoot and we still ride together a bunch, 30 years later.