Read off your steam lists, starting from the top. (Include categories.)
PS: I seriously need to re-organize mine.
*Favorites
-Blockland --> 288 Hours. (ofcourse not counting the launcher hours I had)
-Garry's Mod --> 2672 Hours. (Yes, really.)
-Psychonauts --> 63 Minutes
*Action/Shooter
-Counter-Strike: Global Offensive --> 5 Hours
-Counter-Strike: Source --> 25 Hours
-Half-Life 2 --> 16 Hours
-Half-Life 2: Episode One --> 21 Hours
-Half-Life 2: Episode Two --> 32 Minutes
-Left 4 Dead 2 --> 5 Hours
-Team Fortress 2 --> 152 Hours
*Puzzle
-Portal --> 2 Hours
-Portal 2 --> 100 Minutes (I beat it on Xbox, so didnt play it much)
*RPG
-The Elder Scrolls V: Skyrim --> 27 Hours
-Fable - The Lost Chapters --> 4 Hours
-Fallout: New Vegas --> 141 Hours (Mostly modded.)
-Sid Meier's Civilization V --> 53 Hours
-Starbound --> 93 Hours
*Sandbox
-The Dead Linger --> 10 Hours
-Minecraft (Added it through non-steam games, for the overlay.) --> (Cant tell.)
-Mount & Blade: Warband --> 64 Hours
-Pixel Piracy --> 3 Hours
-Rust --> 43 Hours
-Space Engineers --> 32 Minutes (my computer cant run it above 5 FPS, hue)
-Terraria --> 333 Hours
*Everything Else (things I haven't downloaded or just haven't organized into the categories I have.)
-Card City Nights --> 5 Minutes (Yes, again, really.)
-Contagion --> Not played.
-Counter-Strike --> Not played.
-Day Of Defeat --> Not played.
-Deathmatch Classic --> Not played.
-Dota 2 --> 1 Minute (???)
-Dota 2 Test --> Not played.
-DUNGEONS - The Dark Lord (Steam Special Edition) --> Not played.
-Half-Life --> 2 Hours.
-Half-Life 2: Deathmatch --> 16 Minutes.
-Half-Life 2: Lost Coast --> Not played.
-Half-Life Deathmatch: Source --> Not played.
-Half-Life: Blue Shift --> Not played.
-Half-Life: Opposing Force --> Not played.
-Half-Life: Source --> Not played.
-Left 4 Dead 2 Beta --> Not played.
-Red Orchestra 2: Heroes of Stalingrad = Single Player --> Not played.
-Ricochet --> Not played.
-Rising Storm/Red Orchestra 2 Multiplayer --> Not played.
-Sanctum 2 --> Not played.
-Sniper Elite V2 --> Not played.
-Team Fortress Classic --> Not played.
-Vampire: The Masquerade - Bloodlines --> 36 Hours.
-Warhammer 40,000: Dawn of War II - Retribution --> 10 Hours.
*All Software (if it counts)
-RPG Maker VX Ace --> 19 Minutes.
EDIT: added time played as of this edit, for those that are curious.