I don’t know any billionaires but I knew some extremely wealthy people and they def worked for it. One only slept from 1-5am, we knew because of their email and document edit times. Also had to supply them with satellite internet while they hiked up to my Everest base camp so they could keep working. Dude was intense but literally built an empire in his industry by himself.

People that were already multi-millionaires at birth? No idea.