This might not be obvious to younger people to whom 3 years is an eternity but people work 30+ years in extremely demanding jobs without quitting. Sometimes it's because you love your job, sometimes it's necessity. Plus in spite of what the internet thinks being a game dev might be long hours but it ain't a "mission critical" job like being a doctor working in a major hospital or an engineer building aircraft that stay in the air or criminal defense lawyers keeping people in/out of prison. People also just work grueling physical jobs for 30 years until they simply collapse.