Accumulated climbing during a ride is a lot kinder on a battery so the duration will be better, a constant climb as Eddie has indicated will keep the battery on it all the time so will become exhausted much quicker.
and 44 miles downhill too, Arne was descending at 35 mph average speed when it wasn't dark or foggy.If I have read correctly the Everesting challenge is 29,028ft (8,848m)
To complete the task using this route, I would have to ride it 7 times, with the total distance being 44 miles which 'sitting here' kind of feels doable.
If only I was so much younger and 7 or 19 times fitter!