First of all welcome to Detailing Bliss
As for polishing, this is my opinion. First of all when your polishing you can't really rush through it, if your after perfection or flawless results you need to take your time. Four hours on a small SUV, I'm assuming like a Rav 4 or an MDX man that's fast. For me 4hrs I'm just maybe getting done the hood, the roof and maybe a door panel...but like I said I take my time and dont rush through detailing.
Are you using a
PC (DA) or a rotary?