I plan on seeing Dream Theater on April 18 in Riverside, CA. Unfortunately, something has come up that night, but I think that I will still be able to see most, if not all, of the second half of the show. The show is scheduled for 7:00. I will hopefully be in the venue by 9:00. Taking into account the gap between 7:00 and when the show actually starts, the length of the first half, and the intermission, how much do you think I'll miss?