I think it’s a useful reference but not a magic number. You could continue to work and explore interests, hence getting constant stream of active income. You could also need large expenses.
$Tesla Motors(TSLA)$ bulls have previously backed the company and Elon Musk by saying how it is a tech company not simply a car company. However, after years of overpromising and under delivering, retail investors should now see Tesla for what it truly is--an EV car company. Its true valuation is probably way lower. I think it's a good stock to trade, not to invest in.
$Apple(AAPL)$ Probably another 2 earnings announcements NVDA will surpass AAPL. After all, AAAPL earnings and profits falling, plus write off investment in developing an Apple car. AI is raging on and chips will continue to be in demand.