If this is your first trip to the SCI convention and are going to try to do any business there (book a hunt, buy a rifle, order a rifle, etc...) I recommend 3 days. It will take you two days of nothing but walking just to see everything, otherwise.
Don't forget to stop by the American Custom Gunmaker's Guild show at the Silver Legacy on Saturday and Sunday. One medium size conference room with the most incredible firearms you'll ever lay your eyes on in one place.
It's a great way to spend the weekend, no matter what your taste in hunting or firearms, it is all there.
