33.3 minutes. According to elementary school mathematics, 1.8 is equal to 1 multiplied by 1.8, so it is 33.3 minutes to calculate that 1.8 multiplied by the speed. Because, one hour is equal to 60 minutes, and playing at the speed of 1.8 times divided by 1.8 minutes, 60 minutes at the speed of 1.8 times is 33.3 minutes.