My limit is generally 2 hours, which I have done pretty often even when I didn't live in Kansas. For me it's 2 hours to Wichita and KC, and I've driven to both cities a few times just for a visit with a provider.
I took a buddy to try his first AMP in Dallas once, and that is 7.5 hours, but we also went to watch a basketball game, so that doesn't really count.