The altitude profile of the Lemosho Route is ideal for acclimatization, allowing climbers to hike to higher altitudes during the day than they’ll be sleeping overnight.
Especially during the first two days, you ascend over a long distance which is ideal to acclimatize as the altitude increases slowly.
The more days you climb, the more time you have to acclimatize. So the 8-day or 9-day Lemosho route has an even higher summit chance than the shorter 7-day climb. They also reduce your chances of getting AMS (acute mountain sickness).