Glad you don't consider it too outlandish. Yes it'd certainly take time, my wild guesstimate at this point is that it'd be done in 12~15 months- it's only 5500miles after all.
Some did in 17months. Others claimed 5-6 months which I suspect not for the entire thing.
I've been to most of the sections near Beijing, some more than a few times. Badaling is a crazy zoo (only an hour bus from Beijing) but in some other sections you'd be pretty much hanging out with yourself or your own group. Attached was taken from Jinshanling.
It's endless ridge walking if you like that kind of thing, & mostly away from the crowd. For one thing, no fancy navigation gear is required as it'd be hard to get lost
For another, you'd experience the diversity of China's landscape, the people & culture as you go through the villages.
Last edited by Ni Jin; 02-11-2021 at 05:30 PM.