Question about c-section

AB

I’had a c section with my first and am planning on scheduling a c-section with my second as well. If I have it scheduled, do I just go in the date and time I’m scheduled for the c-section and they will perform the surgery right away? What if I’m not dilated then? What if my water didn’t break then? How long is the surgery? I can’t remember how long it took with the first because I was out of it . Will I be released sooner than the first time around?