Boretti has $400,000 in a stock fund. The fund pays a 10% return, compounded annually. If he does not make another deposit into the account, how long will it take for the account to increase to $2...

Boretti has $400,000 in a stock fund. The fund pays a 10% return, compounded annually. If he does not make another deposit into the account, how long will it take for the account to increase to $2 million? (Do not round intermediate calculations. Round the final answer to two decimal places.)