I think a lot of requests get repeated once they fail. So in reality it's a lot less. Don't quote me on that though.
serious question - what sites are you visiting that you run into these issues? I use chrome without any adblock and have for as long as chrome has been around. I have NEVER once ran into this situation.
You probably run into hourly since you don't use adblocking, you just don't see it because trackers/analytics engines aren't usually visible.
(I hope) it was just a poorly written JS that retries on failure