Short Steam Games

Waking Mars

spore, its relatively short before the space stage

Portal 1 - 4h

Surprised that Bastion isn't on this list yet.

Braid, Trauma, Hotline Miami and Lume were rather short.

The Wonderful End of the World is pretty short

" INB4 "you don't have time to play but you had enough time to enter over 4k giveaways?" :P "

story of my life

Lol at the winner of Magnetis.
Rather insulting don't you think?

Not sure if anyone mentioned this, but it might help; it is not just Steam anyway:

http://howlongtobeat.com/

Cheers!

samorost 2, botanicula, Haamlet

Windosill, Elizabeth Find M.D. - Diagnosis Mystery - Season 2,SEASON OF MYSTERY: The Cherry Blossom Murders, Samorost2, etc.

serious sam the random encounter

FORTIX!!!

Lume - 30 mins

Zeno Clash - 3h

no-one's said it, so Mirror's Edge
it's only a couple of hours of (awesome) gameplay, and has very, very limited replayability

nontheless, it's still a good game :D

Snuggle Trucks <3

Rogue Warrior is very short, I finished it in 1.6 hours.

Noitu Love 2, Wizorb, Jamestown, Ben There Dan That + Time Gentlemen Please, A.R.E.S., Portal, Dear Esther

Super Hexagon? 20 seconds, anyone?

Plants vs Zombies!!!

Lume - 40 mins
Nikopol - 60 mins
Dear Esther - 60 mins

Home is the shortest i've played