Abdullah just got his driver's license, and he wants to buy a new sports car for SAR 60,872. He has SAR 7,000 to invest as a lump sum today. Abdullah is a conservative investor, and he only invests in safe products. After approaching different banks, he is offered the following investment opportunity: AlAhli Bank's savings account with an interest rate of 10.4% compounded monthly, then amount of time to buy the car is years. (Round to two decimal places.)