10 hours of probably the best main menu in gaming, Halo 2. This one comes without the campaign and multiplayer trailers so it's pure Blue Menu. So enjoy the menu music in the background of all the things you do.
10 Hour Halo 1 Menu : https://youtu.be/Hz28AmsHSG0
10 Hour Halo 3 Menu: https://youtu.be/I1y8mskeo4k