I will be taking a long flight very soon and I intend to use my laptop to play music for the longest portion of time I can. Other than turning all settings to the lowest possible to run music, and having the laptop shut, how can I squeeze the laptop for a maximum 9 hours? It would be opened once, started to play and shut/forgotten. Another item of note is that the laptop in question runs Vista and I am fairly confident in it's power management utilities.