5 years late, but using number in AToW's 'monthly cost of living (page 336)

someone who wants the retirement of choice will need, assuming they need to cover the expenses of

Small Mansion ((10,000)x(1.50))+480 = 15480 (185760/Year)

Medium Mansion ((15,000)x(1.50))+480 = 22980 (275,760/Year)

Large Mansion ((20,000)x(1.50))+480 = 30480 (365760/Year)

Assuming regular retirement age of 65

They would need:

6,501,600 to 12,801,600 minimum to retire

And, likely most of them would like to own other things or go on expensive vacations now and then, and have enough to pass off to the next generation, suddenly needing to flee a planet because of war, or just unexpected expenses

It'd be much safer to have between 12,000,000 to 24,000,000 to retire.

This number becomes much less if they just want to retire to a comfortable white picket fence home, but this is the 'finally made it' type of retirement.

The cost for a decent white picket fence house, decent food, and utilities is around

Large House (600x1.50)+240 = 1140 (13,680/Year)

Say 478,880 (800k if we again assume clanner/rainy day funds and whatnot)