Heres my math: Assuming Bitcoin doubles in price every four-year cycle (which is a conservative estimate imho), it would take about seven cycles to go from $60,000 to $6,000,000 (a 100x increase). Thats less than 28 years.
I don't think the price doubles every 4 years for the next halvings. I think we get to a point, like $500k when the price doubling to $1 million in the next four years is not feasible, I'll speculate that it stops doubling in value before that price even.
It's important I point out that this are just predictions and the market will act however it wants.