Java Music Duration

[TwilitHikari]

Hi, I'm working on my culminating project for my grade 11 computer science course and I was planning to work on a music game.
I want to get people to import custom songs by placing them in the folder and loading it in the app. Anyways, I want to know how i can obtain the duration of the song that is playing so that I can end the program when the song ends (I think I can get away with just randoming the notes mapset).