Karl Egloff, a dual Swiss-Ecuadorian national, on 13th August 2014, is believed to have ascended Kilimanjaro in 4 hours 56 minutes, breaking Kilian Jornet's record of 5 hours 23 minutes set the previous year.
Like Kilian, Karl climbed from Umbwe Gate to Uhuru via the Western Breach, and descended to Mweka Gate. After 4 minutes' rest on the summit, he descended to the park gate in 1 hour 42 minutes. His total ascent and descent time was therefore 6 hours 42 minutes.
On 22nd February 2006 Simon Mtuy ascended Kilimanjaro from Umbwe Gate in 6 hours 33 minutes. After a 3 minute rest on the summit, he spent 2 hours 46 minutes descending to Umbwe Gate. His total time for the ascent and descent was 9 hours 21 minutes and 47 seconds. Team Kilimanjaro provided the verification equipment and supplied the data to the Guiness Book of World Records.
An unsupported climb means that the athlete does not make use of any support team along the route, or any re-supply points. This means that he is required to carry all the equipment and provisions needed to complete the route from the start point to the end point, via the summit. This endeavour is substantially more difficult than a supported climb on which the athlete begins in running gear, with no need to carry warm gear needed for the summit phase, and no need to carry much food either.
Simon's main challenge was finding water at the usual sources, as most of these were dry in February, being the dry season when rivers are mostly empty.