Your first goal should be to accumulate a sufficient amount of cash in the account to cover 30 days worth of living expenses. Once that's achieved, your goal should be to add another 30 days worth of living expenses. The account should have between three months and six months of living expenses if you're a salaried employee, and between 6 and 12 months if you have a self-employed job or paid entirely by commissions.
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If you have 20 years left to live and only require $60,000 a year, having $1,200,000 can also be considered enough even if you make zero return. The only problem is that your purchasing power will decline by ~2% a year due to inflation. The other problem is that you don’t know exactly how many years you have left to live. Therefore, it’s always better to have more rather than less.