All individual paid courses are lifetime access. You can go back and review the material whenever you want, so long as you have Internet access.
The FAA Part 107 Practice Test - Prime has an access period of two months. Take the practice test as many times as you need for the two months leading up to your FAA test.
The FAA Part 107 Practice Test - Limited has a shorter access period that expires after three days. If you need an extension, please send an email requesting an extension.
The Fujifilm X Course Membership gives you course access to all included courses for as long as you're paying for the membership. You can get lifetime access to any course by purchasing it individually.