That's about where I am, high 50's to 60 in a minute.I got 55 the other night in a minute, but haven't ever tried this. I'll give it a shot before bed.
The problem with going all out in the first minute is I have little left for the last 2 minutes.
My best results in the challenge is when I do 40 in 40 seconds, rest for 10-12 seconds then sets of 8-12 with a few seconds rest after each set. By the final 30 seconds I'm doing 5-7 only in between brief rests.
My chest has always been my weakest body part by far though, so what works for me might not be ideal for some of you PecZillas.