They don't wait till a day before. I had some ended within hours of the listing (3 days left). There's no telling when it will be ended. Ebay even deleted an auction of mine after it had ended and I'd already been paid.
Oh, and some homo is going to report the auction because you have an obvious shot of the external switch. Half the time a "mod auction" is ended it's because of some fruit cake that failed at modding their own turning you in.