Just asking. Fair note I have Halo CEA, Halo 2, Halo 3 and Halo 4. SO DON’T UNDER ESTIMATE ME!
P.S I compleated halo 3 & 4 in 1 to 2 days (CEA in 3 to 4 days. And Halo 2 in half a month (It was my first one.)
I have Halo CE, Halo CEA, Halo 2, Halo 3, Halo 3 ODST, Halo Reach, HAlo Wars, Halo 4 and 3 versions of Halo Spartan Assault. I finished Halo 3 and 4 campaign on Legendary the day I got them. Halo ODST, Reach, Halo CE and CEA took just over a day (with breaks in between). And Halo Wars, Spartan Assault and Halo 2 took the longest with 2-3 days each.
Halo CE, Halo 2, Halo 3, Halo 3: ODST, Halo: Reach, Halo: Anniversary, Halo 4.
Finished all of them except ODST on Legendary. Logged over 15,000 games of Halo 2 matchmaking through all my accounts, right around 8,000 games of Halo 3. Unsure of Reach, probably around 2,500, and around 1,500 for 4. As you can see, I am not a fan of either Reach or 4. Jetpacking, armour locking and everything else ruined the feel of the games. Halo 4 played to much like a wannabe COD game.