Dude. this was so hard. I had to go to Wikipedia for the answer, but I still couldn't find it. On my 24th try, I just guessed and I somehow got it correct! Could you please extend the time, though?
I managed to get it after about 5 minutes but I happen to be an expert in this field. I still think you should extend the time as most people would find this difficult. Good and challenging quiz though
How about 654621751436462162442020251021014024 hours