I may be more sound sensitive than most, but if I could hear it loudly for even 5-10 minutes I'd be annoyed. 3-4 hours? While I'm at home? Absolutely no way; I'd complain too.
In the UK stationary ice cream trucks don't play music, only those travelling around, so you hear it for a couple of minutes at most as it winds around the neighborhood. I'd also be complaining if it was going on for hours :-)
