How much is enough to retire on when building wealth?

Question by Lisa: How much is enough to retire on when building wealth?
With medical expenses raising each year, cost of living and general day to to day living, what annual income or % of your current income would be enough for you to retire? Are you building wealth?

Best answer:

Answer by mld_public
12-15% of your gross for 40-50 years

Add your own answer in the comments!