Straight up 28 days. Not guaranteed you'll get it issued right at 28 days, that's just the mandatory waiting period. Also, there will be a delay from when the license is 'issued' and when it's mailed and delivered. IIRC printing day for them is Friday, so if you get the 'issued' message on a Tuesday, expect a week's wait at least.
Make sure you do your interview, and get your references to call in as well (after your interview) and it will help things along.
Make sure you do your interview, and get your references to call in as well (after your interview) and it will help things along.