Every store is different but usually, if they intend on hiring you, you'll get 2 interviews on the spot and an instant decision. Again, not every store is the same so don't give up hope.
My store doesn't differentiate on the schedule or breakout who is at the front lanes verses who is at the service desk. It's always 'guest advocate'. Although, everyone that is new is always cashiering for awhile before they even learn the service desk
We have two SETLs, one generally works 9-530s while the other does mids 11-830. Our sales floor TLs usually do 8-430 or 10-630. Closing TL works 2-1030. They all work 40
I only worked 10 or so hours while a senior in HS. I worked 40 hrs while in college though. We have high schoolers now that work 30+ though. I wouldn't recommend that much.