Well, look at the power outputs of bikers. 100 watts can probably get you to 15mph in flats / no headwinds. so that.... well, 400 watt-hours for 60 miles!
Meanwhile, gaming rigs are coming with kilowatt power supplies now, maybe even more.
Laptops try to be more efficient, yeah, but 100 watt-hours in sixteen hours is 6.25 watts sustained.
Did I math that properly?