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edit : I think 2x exp + SND was a huge factor for me
i was hoping to do it under 6 days but missed double xp when i was on hols but im pretty chuffed with how quick i did it this time around (second time) first time took me just over 8 days but i spent a load of time messing around with different weapons and game modes. when i reset again im hoping to break the 6 day mark fingers crossed :-)