Bartholomew got a hot tip on a stock this morning from an investor friend of his. His investor friend said that the stock was going to double in value every hour, but once the stock price hit $800, there was going to be a massive selloff and the value would plummet again. (This sounds like insider trading, which is super illegal, but Bartholomew decided to go for it anyway.) Bartholomew bought some shares at 9:00 AM when the market opened that were valued at only $35 per share. What time should he sell the stock to receive maximum value for his investment?