How long can I use the course once I pay for it? Academy Support August 07, 2020 03:15 Updated For as long as you need it! Once you purchase a course in the GNS3 Academy, it is yours to keep. Related articles Where is the training on how to use GNS3? Can I get a certificate of completion after finishing the course? What is the refund policy? Comments 0 comments Please sign in to leave a comment.