When I was a kid, I milked one to three cows, by hand, morning and evening. We had one that just didn't like to let her milk down until we tickled her udder. Serious!! Her name was "Timid". She didn't have a big udder, but she'd almost fill a 5 gallon bucket when she was fresh!
Better splain... when my eldest was a baby, I wanted to take my wife on vacation but she was still nursing... so we had to take along this pump thingy.