I lived in New Mexico for several years and had so many I was going through a gallon of sugar water a week.
They wouldn't even wait for the feeder to be hung up! As soon as I walked out the door, they would try to feed while I was carrying it - like being buzzed by a swarm of giant mosquitoes!
Mostly we had black chins and rufous, with a few ruby-throats and calliopes in the mix.
I did try to count them once. They would line up on the fence behind the feeder - I usually gave up when I got to 75 or so.
The place my daughter used to go to camp had hummingbirds that were real thick like that. They had a bunch of feeders andf if you went out and stood among the feeders and stayed very still with a finger extended, you could even get one to light on your finger. That was way cool!