The reason I'm asking is I'm usually working as a Linux trainer, sometimes even for bigger companies like the French motorway company or some administrations. Usually these folks want training on RHEL, CentOS or Oracle Linux, and I know I can tell them that, for example RHEL 7 will be maintained with low-risk updates until 2024. Now there's a chance I might eventually do some FreeNAS training in such a training, and one of the first things clients want to know in that case is "how long is it supported".