Talking about quick just earned my 20 puzzle rush achievement even 30 seems quite hard It seem really steep when we talk about anything above 40 puzzles or more.
How much time Hikaru spends per one move in his highest (so far) Puzzle Rush achivement
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Today (April 3 2019) Hikaru repeated his puzzle rush record:
https://www.chess.com/puzzles/rush/hikaru/2twziA
He successfully solved 55 problems which contain 151 moves in total:
5 problems with 1 move {1,2,4,10,11}
29 problems with 2 moves {3,5,6,7,9,12,13,14,15,16,17,19,20,21,22,23,24,26,27,31,34,36,38,40,41,44,48,51,55}
12 problems with 3 moves {8,18,25,28,29,30,32,35,37,42,46,52,}
2 problems with 4 moves {33,47}
2 problems with 5 moves {45 53}
2 problems with 6 moves {39 49}
2 problems with 7 moves {43 54}
1 problem with 8 moves {50}
So he spent on average ~2 sec per move. Amazing!