J.K.
I only saw one ice cream truck one time this summer. The music was down so low that he was just about out of sight before I noticed. It was about 7:15pm. I remember the time because one kid was home and the other was about to come home from karate.
At this time of year, my kids (and the other neighborhood kids) are sometimes still playing outside at 8pm so I could see them wanting an ice cream truck treat. My problem is forking over $4+ for one! Yikes.
School hasn't started here yet. When it does, bedtime is 9-9:30, so hearing the truck at 8pm wouldn't be a bother.