Yea, that's something I've been coming to terms with, as well. How could I really know what I'm doing if it takes me (at least) an extra hour to reach the same standard as "non-adhd" me would (given that I'm distractible, not hyperfocused)? And how can I justify that in a world that demands efficiency over quality?

Those questions were actually a few of many that sent me along my way to adopting anarchy as my politics of choice, lol. I thought, this country that I'm in (USA), these socioeconomic values cannot allow for me to be an equally valued member of society. I lack some of the systemic indicators for competency and value that other people have. Too many people lack similar or other indicators for value. We rely on an incredibly stagnant and moderately passive value system to make changes. We play to common sensibilities to enact change. That change can only go so far if we don't undermine our social foundations and rebuild anew.

I'm not trying to sell you anarchist politics. What I'm saying is that you should find a value system that makes you feel a little less guilty. You don't need to turn your additional test time into a middle finger to the establishment, like I might have if I had these thoughts in college. But you should find a system in which you are given that time because you are of equal value. For me, the guilt was a lingering denial of what made me non-normative, which came from a sense that non-normative meant 'of lesser value'. Maybe it's the same for you, maybe it's not; regardless, I hope you find a way to not feel guilty about your extra time. You deserve more than those crumbs of recognition.