The e-mail when you submit now says it could take up to five business days. if you submitted Thursday then they have up to Wednesday to still be in the time they promise. I wouldn't worry about it unless it takes longer than that. They might have had an unusually large number of submissions, some reviewers may have quit and haven't yet been replaced, or maybe some reviewers decided to take a few days off. Taking more than a day or two is not a crisis, and is still a lot faster than most other agencies.