The combined length of Splinter Cell: Conviction‘s single-player and cooperative story modes is 12-16 hours, according to Ubisoft man Patrick Redding. “Game length for story (SP and COOP combined) should run between 12 and 16 hours,” the Game Director said in a Facebook live chat. “With Deniable Ops, it will be interesting to see how much replay value players get out of it!”
Lead Game Designer Steve Masters has previously said the single-player mode will take around 12 hours to push through, while the co-op prologue has been said to offer 6 hours worth of gameplay. Appears these were the very best case scenarios, then.