The Rongai route takes 7 days to climb, while the Machame route has two variations, a 6-day climb which has a lower summit success rate and a 7-day climb that has an extra acclimatization day offering a higher summit success rate.
The Lemosho route, on the other hand, takes 8 days to complete. It is one of the routes that we strongly recommend.
The Marangu Route is the shortest route by comparison as it takes 5 days to complete climbing the mountain. The five-day Marangu route is not recommended as it does not give you enough time to acclimatize.
Compare all the Mount Kilimanjaro Routes here.