I'm just thinking of homework during the first years of elementary school, which I could easily do but which I couldn't at all concentrate on. It took longer than the few minutes it could have taken, because I hated having to do what I already knew.
Even though I didn't like it when I was left alone to do them, it helped a lot to make me get them done. I left the table and ran into the living-room and would be sent back then, which was the right thing to do. I also never stayed seated for more than a few seconds or at most a few minutes and would instead run around or stand on my chair, dance around or do other silly things. I'd do homework standing, from across the table etc.
If left to do spending time on something else, I'd get back at my homework after no more than a minute or 2. Apparently, I was responsible enough to know I had to get back at homework eventually.
Today I have music on when I do work. I also have the TV running in the background, but I think that is not very typically autistic but more of an AD(H)D symptom.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett