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 access course material anytime during the week, whenever is most convenient for you. The release dates and times refer to when content will be published, not when content must be accessed.
To get a better sense of how our courses and platform work, take a quick tour of the Demo course.