Zylonity

So I wanted to listen to music and I ran Spotify on my phone, I fell asleep and woke up the next day with the phone still playing music, it's been charging and listening to music for about 7-8 hours on my S9+ (quick charging) The battery obviously didn't get to 100% I'm usually a careful person battery wise and I've only had this phone for less than a month. How much damage have I caused it?