What is your 2 hours?

Can a human run a marathon in less than 2 hours?
Reading about the attempt to break the 2 hour barrier, I’m thinking about how important it is for us humans to have clearly defined goals that are easy to understand and easy to measure but hard (but not impossible) to achieve.
This goes for world class athletes as well as for organizations. That’s why a method such as Objectives & Key Results (OKRs) is so powerful.
What is your 2 hour limit?