You have lifetime access to your Culinary Rx course.
If you purchased a course after May 2019, you have no deadlines for assignments and no end dates.
If you purchased your course before May 2019, you may have graded assignments and an end date for your course. After you graduate or your 60 days expire (whichever comes first), the only areas locked will be the quizzes, instructor-graded assignments, and the Question & Support function. Other than that, you will still have all the lessons, recipes, etc. to review at your leisure.