Your great-uncle Buford passed away. You didn't really know him. But you found that he left you $591,298 in his will. You have decided that you wanted to invest that money, and not touch it until it has grown to $1,000,000. If you believe you can earn 9.46% per year on your investment portfolio, how long will it take for your original investment of $591,298 to turn into $1,000,000? (Please respond in years, with two significant decimal points - e.g. 8.45 for 8.45 years).