From a religious perspective, I think our purpose should be contributing something to the world as long as we live. Work is one of the best forms of contribution, which is why people pay for it. If I'm just sitting there living off a hoard, I might as well be dead. I would not be happy to not work.
I would be happy to work "half time" though, about 20 hours/week. I'm aiming for $25k this year or next to achieve that.
But if I didn't want to work at all, it would be at least $2M. It would make me very anxious though, with inflation and all.