Afan is designed to last for a certain time before it will have to be replaced (planned obsolescence). the fan only has one speed (at a maximum of 725 rpm), and it reaches the speed in 4.0 s (starting from rest). it takes the fan 9.0 s for the blade to stop once it is turned off. the manufacturer specifies that the fan will operate up to 1 billion rotations. andre lives in a hot climate, works outside of the home from approximately 8: 00 am to 5: 00 pm, monday through friday, does not own an air conditioner, and can't sleep with the fan running. estimate how many hot days andre will be able to use the fan, rounded to the nearest day.