I plan on doing this again to try to hit last years record of 113.
I did sets of 5 on the minute for 20 minutes. This was unsustainable for much longer than this. My HR would reach ~175-185 about 15s after I put the bar down.
Then I just went as I could.
Sets of 3 are smooth. There isn't nearly the ramp up on the heart rate. PL54 on IGx noted this as well.
Grip was fine, I did chalk up though every so often. I didn't wear a belt.
The DOMS from this lasted about 5 days.