how many times per week can I do squats?

[the hulkster]

Once is all you need of you are trining legs which to me should include more than just squats.

[Papi93]

Once a week would be a good starting point. As you become more advanced, the intensity will be so high that you might not be able to recover in 7 days. When this occurs, you will not be able to squat every week. Choose quality over quantity.