From Turin to Milan

Hi there,
A friend and I bought a flight ticket to Turin for four days with the idea of also going to Milan.
What is the cheapest way to get there?

We will be there 4 nights. Is it too much for those cities? Should we go to another city for one day?

Please advise

Thanks

S x

By train Milan is an hour and 22 minutes - 2 hours, depending on the type of train you take. Why not play it by ear? If you feel like you've seen enough of Turin spend a day in Milan. There are frequent trains.