<prompt> Human: My friends had a heated debate on whether or not 9 million dollars can last you a lifetime living a normal lifestyle. Can someone give us a reasonable answer?  <response>: Absolutely. Theres a thing called a safe withdrawal rate which indicates how much money you can withdraw from an account and have it still last a long time due to interestgains. With 9,000,000 you should be able to take out at least 250k a year and have it last for the rest of your life.Even without any gains, and even accounting for inflation if for some reason you dont put your 9M in an account that at least guarantees inflation which do exist, thats easily 100k a year of tax-free income with no need to save for retirement. Thats a lot of money to spend in a year. 