I think you can make it to 5 million in maybe about 12 years at FAANG. Maybe quicker if you're frugal. More if you raise the ranks quickly.

I don't think your math is mathing. To end up with $5,000,000 after 12 years at, let's say, a constant 5% annual interest rate, you will need to invest over $25K per month over that time, or $300K per year of disposable income, after taxes, living expenses and so on. You would have to be very high level even in a FAANG to be able to do that.

I know, I know, everyone on HN says entry level FAANG makes $600K/year and drives a brand new Porsche, but it's not reality.

I'm not sure that's quite feasible. 2-2.5M in 10 years is about the best I've seen excluding getting reasonably lucky with major stock jumps. You could juice that a bit further with really aggressive savings, but for most people, you're looking at 4-5M in income pre tax over that 10-12 year period (maybe a bit higher), weighted mostly toward the end, so without a ton of time for market gains to help.