How long can I use the course once I pay for it? Academy Support August 05, 2015 15:36 For as long as you need it! Once you purchase a course in the GNS3 Academy, it is yours to keep. Related articles How do I request a refund? Interested in Teaching with GNS3 Academy? Can I get a certificate of completion after finishing the course? Where is the training on how to use GNS3? Comments 0 comments Article is closed for comments.