[ThePrettyPhysicist]

Let me explain this a little better - 47 minutes assumes that the ambient air temperature is around 70 degrees F. You can't cool the water any lower than the ambient air temperature - its not possible. So you won't be able to get the water to 60 degrees F for long unless it is 60 degrees F outside. If you are adding ice, theoretically, I need the atmospheric pressure where you are located and the total mass of the ice. The calculation would then require some extensive calculus. But since I'm sure that you don't really care about all of that, I would suggest an hour cooling time at least ....