Most climbers begin their summit attempt between midnight and 3 AM. Fit and well acclimatized climbers rise and leave later, overtaking other groups during the climb, and can reach the summit in around 3–4 hours, but people frequently take twice that time. The route is usually very clearly visible between the penitentes, and follows the main glacier up directly (across the bergschrund and directly up a ridge) or along an arête on the right. Following that it curves behind the mountain when viewed from Zongo pass. The final approach is fairly exposed, either directly to the summit, or along the summit ridge. The summit is small and frequently has a pronounced cornice, reducing usable space.