IX: 3h 34min, camping with rocket launcher
Voyage of Despair: 5h 5min, camping with WW
Blood of the Night: 4h 50min (101), trap strat
Classified: 4h 9min, shield strat
Death of the Night: 4h 30min, camping with WW
Ancient Evil: 4h 13min, camping with WW
Alpha Omega: 5h 55min, camping with shotgun
Tag der Toten: 2h 50min (106) camping with WW
After playing all 8 maps I have to say that the game had such a good potencial, but casual (or normal, idk the name) mode makes the game repetitive, yes you can play extreme mode but after round 55 (or so) the zombies are faster than you, making impossible to train them the same way as other cods.
Elixirs make the game easier, even pointless, as you can use all 4 in the same round, it is really hard to run out of ammo, the only problem you might have in this game. I also used the talisman which gives you 1 extra life, even though 7/8 games were flawless.
I watched the extreme WRs and I really think that I can only achieve 2 or 3 round 100 hahaha, I should give them a try.