Based on my conversations with the pros (including Rod Widmer), they pitch into the first batch of wort while the second is being mashed. Widmer's has a 250 barrel system with six 750 barrel fermenters and six 1000 barrel fermenters. The mash tun keeps cranking, 23 hours a day. ONE person runs the operation.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk