Set length

It is my understanding that both bands will play the same amount of time (my guess is 90 minutes unless there's no opening bands), regardless of who is closing.
 
Symphony X played first tonight, and they played for about 80 minutes. There were FIVE opening bands, but I only caught one of them. The whole show started at 5, Symphony X started at 8. My guess is that Overkill came on at 10, but I didn't stick around for them.