Yeah 3 million is a good minimum, but it also matters whether you keep working or live off the wealth generated. You want to be sure you never have to cut into principal, even with potential expenses like tuition, school trips, inflation over time, I'm kind of using 5% average return as a target, which is conservative.I guess it depends on where you live, and how much real estate is part of the equation. I figure 3 million in the market would provide what you talked about for most places. Should be able to get 250k no sweat, and probably more like 300k, before taxes.
I've always operated off if $3mm, but my financial advisor started bringing up a number of items I'd not considered, so I'm calling it $5mm now.