The most played DLC or expansion is goes to the Terraria1.2 free content update. 

Assassin's Creed IV: Black Flag won the No Bathroom Break award with an average uninterrupted game time of 3.14 hours.  That's interesting to me because my experience with AC: III boiled down to taking a million little breaks just to avoid destroying my gaming space out of sheer frustration.  So good for Black Flag for maybe halting that trend. 

MOUNTAIN VIEW, Calif. - Dec. 17, 2013 - Raptr, the leading community for gamers, has revealed the results of its third annual Most Played Games Awards.  The awards provide an inside look at exactly how gamers spent their time based on gamer behavior and activities, including average individual playtime, average session length, and total playtime share. 

The recipients of Raptr's Most Played Games Awards of 2013 are as follows:

Raptr tracks actual gameplay data from its growing user base of more than 19 million gamers.  Awards are based on total playtime, total playtime within a certain time period, percentage increase in playtime (between two 30-day periods), and average session length within a certain time period.  Games on the Wii and PS3 platform are not factored into these awards, due to data capturing restrictions.  Please view the full report for more details. 

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About Raptr

Raptr is the leading community for gamers, with more than 19 million users.  Gamers love using Raptr to connect with all things gaming, to track their gameplay activity, build their gaming rep to see how they stack up against friends, and earn rewards for playing games on console and PC.  More than 40 game publishers use Raptr's Community Platform to connect with gamers and build a vibrant fan base around their games. 

Created in 2007 by a world-class team led by CEO and founder Dennis Fong (co-founder of Xfire, Lithium, and Gamers.com), Raptr has raised more than $27 million in funding from investors Accel Partners, Founder's Fund, DAG Ventures, and Tenaya Capital.  For more information about Raptr, please visit http://raptr.com.