Courses on BMF.io don't really have an official expiration date, but that doesn't mean they'll be up forever. Teachers can take them down whenever they want, and sometimes BMF might remove them too. Could be for updates, changes, or just because they feel like it. So even if a course has been around for a while, there's no promise it'll stick around. If you see something you like, it's probably best to grab it while it's still there. Waiting too long might mean missing out completely. Once it's gone, it's gone—unless the teacher decides to bring it back, which doesn't always happen. So yeah, no countdown timer, but still a good idea not to procrastinate.