I mean they work in groups of 3 or 4 people.
Three people rotate the lifts. Person 1 lays down, rips out three quick reps, hops up, Person 2 lays down, rips out three quick reps and hops up, Person 3 lays down, does 3 quick, and Person 1 starts again. Total time, around 30 seconds.
On max...