After a short time on Mt Kilimanjaro at Uhuru Peak, you generally want to get back down to Barafu Camp. It can be very cold at the top. You might not feel well. And, although the summit was an amazing life-change experience, you generally are ready to leave and head back.
Descending to Barafu takes anywhere from 2 to 4 hours, depending upon how fast you choose to travel. A great way to get down quick is to scree slide, which is running down the loose gravel at medium speed. Beside getting the occassional gravel in your boot from the scree slide, it’s a nice way to descend and kind of rush.