I don't have any sort of confirmation on this, but I think some applicants were told it could take two weeks from the interview day. My POI contacted me one week after the interview, but I've had other people on SDN tell me their POI told them it would be two weeks. I assume that some of the professors have not extended their invites yet, but again this is just my speculation. I hope that helps! I know the waiting game is so hard!
It does help, thanks! I wish I knew when to expect to hear from schools. The waiting is the hardest part and I can't seem to focus on much else. Can I ask if you interviewed on 2/15 or 2/17 and with whom? Feel free to pm if you prefer.