Here's some info about the Maingate site:
https://www.disneyfoodblog.com/2020...t-a-covid-19-test-when-youre-in-disney-world/
This part was interesting...
"Update! We initially visited the testing site back in November but a reader reached out to us with a different wait time experience. The reader arrived at the site in early January at 9AM to see the line filling and spilling out of the parking area. The wait to get to the front took a whopping
four and a half hours. During that entire time, they noted that there were
never more than one or two windows open at the testing counters. Several elderly folks had to have folding chairs brought to them during the wait."