2-3 days if I recall correctly. sent invite via snail mail and then updated AADSAS about a week later.
Horse40-
I have heard that it is possible, but good luck dealing with the admissions staff at Nova. They are usually very short on the phone. I called today and I was put on hold, transferred to 3 offices, and finally some lady told me "no earlier dates" and hung up. I doubt if she even knew what question I was asking.