I was told by a rep that it takes at least two business days for them to put the letter into the mail, but my friend told me his took 3 weeks. Congrats on getting accepted, I'm still waiting for my OCT 1st SAT scores to get sent from CollegeBoard...
But according to the rep, there's not much in the letter you don't see online in OASIS, it's the same financial aid package, with about the same info.
Please check back and let us know when you get your letter though, I'll be wondering that myself. And do you know how long it took for CB to send them the SAT scores? I heard it should be less than 4 weeks, and it's been almost 3 weeks since CB said they are sending the scores (OCT 18)