edX courses are not "live", so there is no set time when you will need to be viewing the course.
All lectures are pre-recorded and available 24 hours a day so that you can review the lectures anytime during the week, whenever is most convenient for you. Some instructor-paced courses may publish the the course materials periodically throughout the course duration, or set fixed due dates for assignments for exams. You can read more about how edX courses are paced in this article.
To get a better sense of how our courses and platform work, take a quick tour of the Demo course.