I have a thread over in Community Creations that’s basically a combination of longplays and a collection of as many canonical Halo videos as I can find (split into ‘Seasons’. A game is a ‘season’). If you’re bored/need something to do that’s Halo related, or just need some background noise while you wait, check it out:
Halo Chronicles: The Essential Longplay Collection
Season 1: Halo CE Anniversary (HD)
Season 2: Halo 2 (HD)
Season 3: Halo 3 (HD)
Season 4: Halo 3: ODST (HD)
Season 5: Halo Wars
Season 6: Halo Reach
Season 7: Halo 4: Forward Unto Dawn
Season 8: Halo 4 (HD)
Season 9: Halo 4: Spartan Ops
Season 10: Halo: Spartan Assault (HD)
Season 11: Halo: Nightfall
Season 12: Hunt the Truth
Season 13: Halo: Spartan Strike (in progress)