This is illuminating. I've not sifted through the log carefully, but I'd think that the process of this climb is a multi day process, due to the distance involved. 28 miles up on the Marangu Route, usually 5 days to climb (6,000-19,000ft)...contrasted with 11 miles in 3 days(8,000-14,500)

They shoot for 14k on the 2nd day.

http://www.absolutekilimanjaro.co.uk/marangu_route.htm

That seems aggressive to me.