The words 'have to' are doing a lot of work in that statement. Some people 'have to' work to literally put food on the table, other people 'have to' work to able to making payments on their new yacht. The world is full of people who could probably live out the rest of their lives without working any more, but doing so would require drastic lifestyle changes they're not willing to make.
I personally think the metric should be something along the lines of how long would it take from losing all your income until you're homeless.