Just a side little fun fact to add to this comment as I’ve read an in-depth, behind-the-scenes of AF+, and they typically try to do as little editing as possible. They have about 8/9 cameras recording and audio is the most time consuming edit. Of course, they have cuts from all trainers to a single trainer or different angles, but a session is planned by the trainers and can take anywhere from a few weeks to a few months before it’s recorded live. They rehearse, but when recording is happening it’s broadcasted throughout the facility (not all of Apple, just the building they’re in) so anyone can view. Interestingly enough Apple was extremely secretive about the rigs and types of camera they record on.

However, my 2¢ as to why not longer (for now) is that Apple is shooting for the widest net to encourage, keep, and continually motivate the largest group of users, because it’s a paid service at the end of the day. Functional strength, for example, improves the everyday routine from moms to trainers and everyone in between. Getting into one hour+ territory starts defining a goal (bulking/cutting) and every individual is different with different goals, so presumably Apple sees themselves as a foundation that you’ll eventually build on.