There are no deadlines for Sophia courses. However, you will want to keep in mind the ACE renewal dates if you intend to drop a course or if a course becomes inactive. If a course is renewed by ACE during your time taking it, and the course is dropped or goes inactive for any reason, the course will need to be reset from the beginning for you to retake. This is because when a course is renewed by ACE, we often need to make changes to the course to maintain its credit recommendation from them.
To avoid a course automatically becoming inactive, make sure you work on it periodically, as it will be dropped after 180 days of inactivity.
You can view the ACE course list and see the renewal dates for all of our courses here: https://www.acenet.edu/National-Guide/Pages/Organization.aspx?oid=76099b28-9016-e811-810f-5065f38bf0e1