Takes but one horse power (or less) to get up the hill. If.. that is. you have enough time.
I"m one HUMAN power and have climbed many hills or the same hill many many times. (Grew up on a pair of hills which we climbed every day. multiple times a day... If you ever get to Greenfield VIllage (Dearborn, mi) there is a Doctor's office there (A doctor Howard as I recall but I may have the name wrong) Docent said the office originally sat on a farm called Windfall.. About a mile to a mile and a half from where I grew up.