How drop-in visits extended stay rate works?

Hi, I am not sure about how the drop-in visit Extended Rate works.

Does an extended rate mean that I stay longer than 30 minutes?, or does it mean that I would do 2 or more drop-in visits per day?. I have problems with a client that wants me to go twice per day to take care of her two french bulldogs. First thing that I notice is that every time she books with the "Drop-in/Extended stay" option, Rover automatically charges for each dog even when my settings says that I DO NOT charge for an additional dog for Drop-in visits, this always creates misunderstandings since the customer thinks that I'm charging twice the price agreed. Also she request the extended rate because she assumes that the extended rate means that I will go twice per day, however when I receive the booking request and I check on the field "visits per day" it says 1, and the extended rate is applied for both dogs when it should be just one. I always have to make the adjustment manually to reflect 2 visits per day, and 20 dollars rate for one of the dogs while the second dog is $0. Anyways, I just want to make sure how the customers should request the service when they want 2 drop-in visits per day, also I want to make sure that rover doesn't charge per dog when I have established that I do not charge per additional dog.