For once, before i start writing I am trying to do some research

I've looked through some threads but not found the exact answer to this question.

How many classes to the Hogwarts students have in a day?
How many before lunch? How many after?

Do the students get "frees" that they can spend doing work in the common room or library?

Any thoughts would be very welcome as the logistics of this question are starting to hurt my brain >.>

~Russia xxxxx