Are there any rulings for out-of-combat concealment?

I was thinking of out-of-combat uses for the Child of Shadow stance (I’m guessing that out of combat it would grant concealment as long as the user is moving + a bit after), but I don’t know if there are any concete rulings for concealment out of combat, such as enemies having to do a Spot check or not seeing the character, or if there is an augment in the DC to see the character or if it’s entirely up to the DM how to apply that.