To retire comfortably and live off $40,000 per year, one would need $1 million saved, assuming a 4% withdrawal rate.
"Well, in order for you to retire, you want this number to be 4% of your total nest egg. So, if you want to live off of $40,000 a year, this has to be 4% of how much money you save towards retirement, which means you would need $1 million put aside to be able to retire comfortably"