You need the same amount of income when retired as when you were working
Sure you don't have to put kids through university, but might want to go on cruises and see some of the world
In fact, apart from enough of an income, you must have decent medical insurance as well
I have seen friends financially crippled from paying R8m - R10m to hospitals and doctors who insist that it is your duty to keep a loved one alive come what may
You also have to make sure your income keeps pace with real inflation, not the pie in the sky figures trotted out by SA Stats. These are pure fiction
You should be able to put away at least 15% of your retirement income for large expenses - new cars, house repairs, etc
Its not difficult if you start early enough. Compound interest is your best friend