> 3rd- Afton, Minn, then drive 8 hours to Mt Bright
This seems low too. Google maps gives it 9:40. Depending on what time of day you hit the Chicago area, that could add to the time. Plus you have a 1-hour time change working against you. (Don't expect to leave Afton at noon and pull into Brighton at 8 pm, I guess is what I'm saying.)
Sooner or later your legs give way, you hit the ground.