Cd Player In A Moped How Long Will A 12 Volt Moped Battery Last With A Cd Player And Speakers Wired To It On Average?

How long will a 12 volt moped battery last with a cd player and speakers wired to it on average? - cd player in a moped

I'm going to buy and audio cable set speakers and a CD player under my seat when I go to parties, like the seats. I was curious how long a full charge of the 12V battery lasts an average of a moped, if anyone know or done this before? Thanks