So here is the thing, I am playing an urban druid, and well there are some things about thousand faces that have left me quite confused. Unfortunately after looking through the board I cannot find any clarification to my confusion.
So first off the Rules.
Small creature: If the form you take is that of a Small humanoid, you gain a +2 size bonus to your Dexterity.
Medium creature: If the form you take is that of a Medium humanoid, you gain a +2 size bonus to your Strength.
So here is the thing I am having a hard time wrapping my head around. Thousand Faces is an at-will supernatural ability, and as such is not the same as casting a spell, from my understanding. It says it that you change shape as if using the alter self spell. So does Thousand Faces have a duration. Does it last 1/minute per level, at which point the druid has to come out of it, and reuse it, since it says that they can only use this ability in their normal form. Or can you maintain this ability indefinitely and only change forms by dropping back to your normal form.
My thoughts is that you can just indefinitely maintain it, since it is a 13th level ability (Urban Druid has to give up wild shape, a 1/hour per level ability for 4 levels to get Thousand Faces early). Otherwise this is a really weak ability, and the Urban Druid would be a much weaker archetype then most people think it already is.
It is not even that strong of a spell, just granting you a +2 to one stat. You cannot even take the form of a specific individual. You can get close, but not exact.