Depends how bad it is and how you let it heal
It needs to heal, so dont be stupid like a lot of people are and say ok it doesnt hurt lets do this!!!
No, you hurt it because your body wasnt able to handle the force you put onto it.
So, if your PT is worth anything he would recognize that ok it doesnt hurt anymore the ligament looks good, lets stop this from happening agian.
IF they give you a stupid ass quad stretch or hamstring stretch, fire them.
Here's how i see it, you said it was a normaml landing, if it was the end of the day your body was probably tired cause you didnt eat or drink water on the chair lift. If it was beginning you still didnt eat or drink right and you have some weaknesses going on.