Primark interview

Hi,
So I’ve got a primark interview on Monday for their night shift role, I’m a bit confused because they’ve said to come at 9pm? Is that normal lool? Idk probably because I’ve seen people being interviewed during the day and stuff so I thought 9pm is so???
Also, would it literally just be an interview? Like it’s not guaranteed I’ve got the job yet? I thought it would be some sort of induction since it’s so late at night idk lool.
Another thing, does anyone know of the type of questions they’ll ask me? They did ask me a few questions over the phone and stuff. And how long until they contact you after the interview?
Thanksss