I was informed that they expire at the end of March. I made a thread earlier because I originally believed they expired Feb 1st. So I offered to give mine away, however that thread got deleted for some reason (probably because we can't give away codes/dlc on here, but I knew that.)
Actually entering codes into DewXP is going to end on the 1st, not the double xp.
And boom goes the dynamite.
40k GS - 2/4/2011 - Deathspank: ToV - A True Hero
50k GS - 9/11/2011 - Deus Ex: H+ - The Snake