How much bank balance is enough to retire at 40 in noida area?

Calculate your monthly expenses then multiply by 12= X
You need 30X to retire

the answer is very subjective. it depends on your liabilities, do you have a family, kids, parents, your lifestyle, any health issues, any property, any side income etc etc. many factors are involved while deciding the required retirement fund. any way just use an swp calculator (google it) to find out how much money you can invest upfront for an approximate regular income (subjected to risks) for 20-30 years