If you need $50k pa in retirement, you just need

1. CPF Life. You will get $1800 pm each or $3600 pm ($43.2k pa)
2. $500k invested in 4% dividend yield stocks or REITs, giving you $20k pa of dividends
Total passive income $63.2k pa. You can save $13.2k pa to take care of future inflation.
At the end of your life you still have your stocks and home to bequeath to your children.

Don't need to be so stupid to need $6m to retire. Foolish.