The runway length is dependent on their expenses. If they earned 100k and spent 50k, it would last 20 years assuming no investment returns. If they spend around

The runway length is dependent on their expenses. If they earned 100k and spent 50k, it would last 20 years assuming no investment returns. If they spend around 4% of their 10 years salary annually, they're very likely to be fine for 30+ years as long as it's invested reasonably. https://en.m.wikipedia.org/wiki/Trinity_study https://en.m.wikipedia.org/wiki/Trinity_study