The entire Mt Longonot hike takes 4-6 hours. The 3.1-kilometer trail up the mountain from the gate to the rim of the crater takes 45 minutes to 2 hours, depending on one’s competence. Once you reach the rim, you have the choice to descend or hike all the way around the crater. This adds some 7.2 km to the hike. A trek around the rim typically takes 2-3 hours.