There was a feature I had on android several years ago where you could limit notification sounds by time. You could pick from 1 to like 10 minutes. The first one would ping you and the rest for that timeframe would be silent notifications until the timeframe ended and treated the next one like normal.

Edit: still a feature on the texting app I use, Textra. I like their features so much I paid for it and keep reverting back when trying stock or anything else. I'm sure there's some big flaw I don't know about since it's an old SMS app though.