I take a different view on the amount of income needed after retirement. When you retire your house should be paid for and your children should be grown ,educated and on there own so your expenses should be a lot less then when you were working full time with a house full of dependents. Let's for the sake of round numbers say that when you were working you brought in 100K, Of that you paid 7.65 % in social security and medicaid taxes or $7,650. then you probably paid 17% state and federal income taxes Or $17,000. Depending on when you bought your house and how big it is your mortgage payments might vary from $600 to $1300 per month or more but lets say $800/m not counting property taxes So $9600 per year. Then you were commuting to work about 20,000 miles a year at $0.50 per mile for $10,000. Lets skip feeding , clothing and educating kids as not everyone has them. So you were living on $ 100 -7.65-17-9.6-10 which equals 55.75K
Now if your retirement income was $56,000 and it came from SS or a pension plan you would not have to pay SS and medicare taxes on it and at that lower income the income tax bite might be just 10% or 5600 your house is paid for, and you don't have to commute to work and your Beemer can sit in the garage and appreciate. So assuming the kids have moved out you have $50,400 to spend on what you want as apposed to $55.75 net from $100K while working. That comes out to your only gaining $2.68 per hour for working a full 2000 hour year.
Oops I forgot that you were contributing 6% a year to your retirement plan or 401K. So you were living on less then $50K.