Time required for a wheelchair to get on board a bus (previous study)

2005 (Hotta, Kawakami, et al.)
Shortest：1min. 25sec.
Longest：9min. 5sec.
Average：4min. 53sec.

2015 (Mimura, Kato, et al.)
Average：About 4 min.(±1 min.)
(of which 3 minutes were used for stabilizing the wheelchair (±1 min.))