This may seem like an odd question, but received an e-mail from one school with an offer. About a week later I decided to accept, but it had no instructions on "how to accept." So I just replied to the e-mail stating that I wished to accept the offer. That was three days ago, & I've had no reply. So today I e-mailed one of the people in the program about the wishing to accept the offer & if there was anything else I had to do. No reply. So how long do I wait? I don't want to seem impatient, but at the same time I'd like some confirmation before I go around declining other offers. Maybe it's best to call in?