I would add that just having a 60-70 hour work week for many jobs means a different lifestyle, even if you're comfortable financially.

Friend of a friend got hukou in Wuhan recently and picked up a crappy job as a convenience store clerk. 10 hrs/day, 3 days off a month. But! She can comfortably live off it in a major city with a studio apt and even save a bit. Doesn't even need roommates.