Do I have to access the course at a certain times?

For INSTRUCTOR-LED Courses:

You can review course materials anytime after they are released to you, but you will not be able to advance to sections that are not yet released. Graded activities that are due on a defined schedule cannot be completed before or after the due date. You should review course materials in time to complete graded activities before their indicated due dates/times.

For SELF-PACED Courses:

You do not need to log in at a certain time to access course materials although it is generally recommended that you keep a steady flow of consistent work. You can complete learning and activities on your own schedule as long as you do so within one year from the date of sign-up. Your employer might have a specific time-completion requirement.  If this is the case, please complete this course within this time frame.