Maybe so, it's been many years since I took the SAT and I can't remember much about that experience. But I think with respect to more general academic performance, extra time on tests won't usually help much. In my experience in college, very few of my peers ever used up the full hour or two given for exams. The ones that did seemed to be worrying themselves sick double-guessing themselves, and it never seemed to do them much good.

I had one friend who I suspected of having a bogus disability. He had rich parents and got double-time on exams. But it's a miracle he graduated at all, he seemed to always be on the brink of flunking out. I think that had a lot to do with his video game addiction that stopped him from studying much. He was a reasonably bright guy with a horrible work ethic, and I really don't think the extra time on exams helped him at all.