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I was like that for about a year and a half post tbi. I could only stay focused for about 2 minutes, and that's only if I put ALL of my energy into it. It would take about an hour and a half to watch a half hour sitcom. My speech therapist had me watching 5 minute youtube videos (on any topic I wanted) and taking notes, which was supposed to help with focus. Now, nearly 3 years post tbi, I'm much, much better.
Just repeat and enough times and your brain will get better and you will eventually need to repeat it less.