I have been in dozens of airports (mostly US) over the years and the large ones easily have multiple baggage carousels. (I tried to find some numbers but could not find the right wording to retrieve any type of answer from Google.)
Google ‘read’ the question Which airports have the most baggage claims as Which US Airlines Are Most Likely to Lose Your Luggage? American was the most likely to lose it, while the three airlines least likely to lose your luggage were Allegiant, Southwest, and Hawaii.
Key West Airport (EYW) has two carousels–one medium and one tiny one. In April 2021, we waited on the tarmac for an hour to even be assigned a gate to deplane and then another hour for our luggage to be put on the carousel.
Charlottesville Airport (CHO) has a half carousel. The single carousel disappears behind a wall for half its circuit. We have to plane and deplane in the open, using a portable ramp pushed up to the plane’s door. This is an improvement over having to climb up and down the stairs on the plane door.
One time, we must have landed when the entire luggage crew broke for dinner. We waited almost an hour for the luggage to come off the plane and finally placed upon the one-half luggage carousel.