I was never able to do it more than 20 times. Don't even try now.
Alot of pro football teams use this as a guide of strength when trying out for a team.
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The same day that I hit my max ever bench about 7 years ago I also did a max reps set with 225 and did 28 reps. I have not tried it again since then but feel pretty confident that at any time I could do at least 20.
That said, I really am a horrible "repper" as a whole.