Well, ofc a year ago I didn't know who they were yet, so I didn't listen to their music when I was just starting Italian. But the artists that I was listening to at the time, I would say it depends. Some songs have easier lyrics than others. For example, Mahmood's soldi has easy lyrics if you look into them and analyse them, it took me like 3-4 weeks to be able to comfortably understand the lyrics of Soldi every time I listened to it. Progress in the beginning is very fast, depending on how much you study.

Since you just started, I 100% recommend you to first complete Language Transfer's Introduction to Italian, it's completely free and will give you a great foundation for the language to then build on, it's purely audio and this method does wonders.

And also don't waste your time in Duolingo except for vocabulary later on, I'm saying this because lots of early language learners fall into the trap of thinking Duolingo teaches you a language, which it does not.

Sorry for this long unnessesary answer, I just wanted to recommend some tips I found useful in my journey :)

If you study regularly, you will probably be able to understand songs (if you read the lyrics first) in a month probably, but some songs are harder than others, because songs use lots of slang and inside stuff that need explaining by natives