I believe you get 7 days if it is not granted. But not 100% sure ask the officer when you are there. But if not granted I have read people who just go to another officer and re apply and get it 😁
it is up to the officer I believe some people get it directly some get under consideration stamp. Some get 60days from applying some get it from when their current visa end. When you go back you do not have to redo the process again. Just get your extension, that is if they grant it to you.
It seems it is common to get a 14 day under consideration stamp and you go back and get the full 60 days after that. Did they ask for an outbound ticket?