The time it takes to climb Kilimanjaro depends on the route chosen. Most expeditions last 6 to 8 days. An experienced hiker with prior acclimatization usually climbs Kilimanjaro through an accelerated 5-day program. If you stay overnight in the crater, Kilimanjaro climbs can take 9 days or longer.
Among the Seven Summits, the Kilimanjaro trek is one of the shortest. For example, climbing Mount Everest takes 6-9 weeks, Denali and Aconcagua- 2-3 weeks. Climbing Kilimanjaro takes about one week only.
Additionally, for those who only have a couple of days and want to get a taste of Kilimanjaro, it's possible to go on a Kilimanjaro Day Hike.