In some courses, I like to do a BB quiz at the beginning of class, on the previous week's material. They are short and usually have a time limit of 15 minutes. I give a 3 minute grace period, so, if the class starts at 1:00 PM, they have until 1:18 PM to complete it. However, even though I set the availability and due date at 1:18 PM, if a student comes in late (for example, at 1:10 PM), the system still allows them the full 15 minutes, which holds up class for everyone else. Is there any work-around for this?