Abdullah just got his driver's license, and he wants to buy a new sports car for SAR 64,480. He has SAR 5,000 to invest as a lump sum today. Abdullah is a conservative investor, and he only invests in sale products. After approaching different banks, he is offered the following investment opportunity AlAhli Bank's savings account with an interest rate of 10.3% compounded weekly (1 year = 52 weeks), then amount of time to buy the car is years. (Round to two decimal places.)