1.2 million (27.5 acres) on a ride on is humping for sure! I sprayed 16 acres in 2 directions (double coverage) in a day two different times this summer and it was all I wanted! That was with a tractor in 3rd gear-high and 14' boom. Just flagging that much ground is time consuming.
Fertilizing I do separately and can fly through that slinging it 52' per pass.
Lots of good info in this thread. Surprised some of the cool season guys are still spraying. We had 15" snow yesterday!