Pro cyclists can sustain 300W for an hour or more, and even trained amateurs can break 200W pretty happily, so 60W sounds like a lot is being left on the table, yes.
For comparison, I'm reasonably trained, and could maybe hold that for 4 minutes. I'm also considerably heavier!
I would guess that a random average adult male who doesn't neglect general fitness, but doesn't necessarily cycle, could put out 160w-220w for an hour if they were forced to.
60W is insanely easy tho, pretty much anyone without some sort of extreme physical limitation would be able to do that.
be sure to note the size of his thighs
333w for 6.5h, 460w for the first climb (35 minutes).