[On September 23rd, 2019 my Grand Canyon crossing (North to South Kaibab) will take] Between 4h30m and 4h45m

Created by WilliamKiely on 2019-09-18; known on 2019-09-24; judged wrong by WilliamKiely on 2019-09-30.

• WilliamKiely estimated 8% on 2019-09-18
• WilliamKiely   judged this prediction wrong on 2019-09-30.