Been wondering about this...

I have an 08 outback with the Kenwood stereo (6 speakers, amp, and no sub.) and the interstate marine cranking battery. How long do you think I can play the stereo at a descent level before it would drain the battery? I would like to have an idea before I jam out on the lake for 2 hours without restarting the boat. Ballpark numbers is all I'm looking for.