Don't think this has been asked before. I consider nest egg as all investments incl
CPF but excluding value of residence.
For me I'd love to reach 2m or 3m but I think a minimum of 1m will be ok.
Also - how much do u think u will spend in a month on expenses after retirement? For me I think around 2.5k a mth, so annual withdrawal rate will be 3% which I think is safe enough.