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According to Steam

7 games over 100 hours (Cities in Motion 2 and Terraria biggest time sinks, 523 and 443 hours)
4 games over 60 hours
4 games over 40 hours
6 games over 20 hours
5 games over 10 hours
16 games over 1 hour

43 games played out of 99 games listed on Steam. (Yet some are double like Ori and Ori definitive edition)
Ending up with unplayed games is easy when you buy heavily discounted bundles.
Most of the games weren't bought on Steam, heck even the physical editions of Civ5 and Beyond Earth are listed under Steam.

I'm currently playing KSP through Steam, no doubt that will rise as a time sink considering I already spend over 100 hours on the demo years ago.