From personal experience doing standby for about 8 years now. Each show takes about 200 from the standby queue. They are only able to sit at the top 3-4 rows of the theater and the planters on either side. If you want to be in the theater i recommend lining up as early as possible, for very popular narrator and/or popular nights I have gotten in line up to 4 hours before the first show. I'm a local so I just know I'll spend my entire day in line, others have reported that getting in line up to 2 hours before still worked for them