You might be surprised. During the peak game length seasons, people would start trickling out around like the 5th or 6th inning, and by the 8th or 9th, the stad

You might be surprised. During the peak game length seasons, people would start trickling out around like the 5th or 6th inning, and by the 8th or 9th, the stadium could get surprisingly sparse even if it started full. My dad and my brothers and I used to have a habit of moving down from our bleachers seats after the seventh inning because there would be enough empty seats that we could often move into ones within the first few rows behind one of the dugouts to get a closer view of the last couple innings (and maybe increase our chances of getting a foul ball if we were lucky, which we generally weren't!). This got especially common when they tried to curb people driving home drunk by ending beer sales after the seventh inning, at which point instead of sticking around to sober up, quite a lot of people just opted to leave once they couldn't buy any more beer.