Running is like life. It is actually long, not short. The more present you are, the longer it feels. The less present you are, the shorter it feels.

I wrote a post on endurance: doing something you like for a very long time.
https://www.shreyashariharan.com/endurance

It takes many decades to do something meaningful and running simulates those decades.

The most common failure mode of startups isn’t that dramatic, it’s just founders who gradually run out of motivation and quit, no different than stopping midway through your run.