12 hour YouTube video, love it, 2 hour film, cannot

Not sure if you explained to the speech therapist that you have autism and difficulties with this. But it may make a huge difference in the way they approach this situation. Also it may help the therapist to know there is a family history of autism and check your son for it to become speech delay/non verbal can be a sign of it in young kids

Tldr I didn’t read your post, the ADHD struggles with long. But my constants are noise cancelling headphones, good quality. Dimmable colour changing lights in my bedroom and a supportive husband who has the same conditions