Sort:  

It depends a lot on living location. If I was in a cheaper country, the needs go down a lot. 3M would be plenty here though.

What would be the bare minimum to get a decent amount of benefit for you?

1 million + house (paid off) would be my bare minimum I think for me and my wife. 60k spending a year, counting for a roi of 7%-8% would even give me some extra level of security. That would let me spend about 5000 each month which should definitely be doable in West Europe in my opinion. Probably I would live cheaper and keep on growing my funds.

Although, I agree with you that I would probably not quit my job, although working halftime would be an option.

Ofcourse it's all spoken out easily but would have to see what I would do if I would reach it.