A long time… I got accepted in January and just heard back a few days ago. I actually emailed them two days before I got in because I seemed to be like the only EA applicant who had not got an answer. I’m thinking they may just be behind?
Edit: also when they responded to the email, they said the honors college doesn’t get your application until after you have been accepted. So if you were accepted RD I would guess that it may take some time to hear anything