said by Jazzemt:Ditto
It is not cracking the wpa. It is using a tool like Reaver and cracknig the WPS which is in most routers and cannot be turned off. And some of the ones where it can be turned off it is still crackable. At that point spofing the mac and knowing the WPS key you are assigned the WPA key and there is a tool or two to show what the wpa key is when you have it local. The longest I have seen it take was two hours. Usually under 30 minutes.