Our son was in a cooperative preschool for a while, so I got to see it in action a number of times. They weren't teaching literacy either. The main focus of the classes were developing the skills you need to be able to function in kindergarten -- things like doing what the teacher tells you, raising your hand, being quiet, playing nicely with the other kids, etc. There was basic learning of the alphabet and numbers. Generalized world knowledge. And lots of play time.

That said, my impression would certainly be that the numbers and/or patterns work (which I would consider low-level fundamental math stuff) amounted to more than one minute a day.