I was just accepted 5/23 off of the alternate list. I found out I was on the list in mid April. I can't really speak for the movement as a whole, but it was roughly one month from alternate to accepted, for me. Good luck!
Add: I did not interview at Creighton this year. GPA:~3.5, SGPA: 3.25-3.3, DAT AA: 20, DAT PAT: 21