I have the same problem. I am new to Airbnb and clicked one day preparation (not realizing what it meant) and then a guest booked which Blocked the week before for weekly rentals. I have asked Customer Support to fix this for four days now, so I don’t think it’s going to happen. they know about this issue. you can’t override it. The only thing I found that I could do is change my minimum stay to six days instead of seven. The problem is that people search for a full week, and my listing will not come up if it’s less than 7 days. I have taken off the preparation day for future bookings. I suggest we all keep calling Airbnb customer support to get this moved to the top of their debugging list.