Six days – five days of climbing and acclimating and one day to get down.
Kilimanjaro has no technical aspect to it and thus enters the debate of being labeled either a climb or a hike. If I had my way, it would just be called a hike, but “climbing Kilimanjaro” has a better ring to it than “hiking Kilimanjaro.”
Regardless, in the end you still end up at 5,985m (19,341ft) atop Uhuru Peak amongst the receding glaciers and upon the highest point in Africa, not to mention, the highest free standing volcano in the world.