As it's a Asus board that means it has to be returned through the place of purchase for the whole of the warranty period so it depends where you bought it from. If it's from OCUK then I believe they have a express RMA system with Asus. If from anywhere else I would guess anything up to 28 days. Don't let the place you bought it from fob you off and tell you that you have to go through the manufacturer. That is not the case with Asus as they do not deal with the end user.