A 20% pay rise is 10% after taxes here and wouldn’t make a huge difference. Also, I hope and intend to work well into my 70s. For that I need to not burn out in my 40s. I’m happy with what I do. I don’t need more money or more years retired. I need a job I’m happy with, money for bills and time with my family now. I pick up kids from school every day at 4 and make them dinner at 5. All this must sound pretty foreign to Americans...
I would never work more in the hopes to retire earlier. I've worked different time models between essentially do whatever I want and 42 hour weeks. All of them paid for my living standard (which I would say is rather simple).
Everything above 35 hours feels like I have no time for myself anymore.
I think the main reason why I don't get the 'FIRE' mentality is because in my country we have a healthy pension system I can look forward to.