The only timeout is when the player shuts down if you havn't turn it back on. Once you turn the car off and turn the player back on, it'll play till your battery dies. The timout can be set to something quite large, though I'm not sure what it is... I really don't think there is any reason to leave it wired permanently...

A feature that would be nice is a way to have the player play until a door is opened. I just discovered this feature after driving a '01 tahoe around for a few weeks, and it was a nice feature.

Matthew