Bird, that sounds about right for the average attic. Our two man crews were expected to do three a day.
You know how hard you worked keeping up with one machine. When we did whole house new construction we had three machines running. Two supplying hoses to two inch holes drilled in the side walls and one to the attic wide open. The machines were all in a 24 foot van truck that carried all the tools and repair parts. We could fix most things that would go wrong. It was a five man crew and I would hire guys right out of the service. Uncle Sam trained them to work well together.
One man supplied all three machines and monitored three radios to the nozzle men. Not easy to do when you only have two ears. The fifth member of the crew tried to cut the holes in the walls ahead of the nozzles filling the wall cavities. He also had to help the loader once in a while by moving bales closer to the machines from the supply truck. The guys would rotate the jobs during the day. They were paid by the cubic foot of the job so they loved those big expensive houses all in the same tract.
Good men, good work and plenty of jobs to make a living for all.
Tim