You'll get quicker as you work over time. You will find more efficient ways to do everything.
My partner and I used to take 4-5 hours on a Durango (for instance) with no swirl removal. I can now do a Durango doing the same job in 4 hours, give or take a little.
Swirl removal tacks on another hour or more depending on severity. I work with a rotary polisher and I have spent 5 hours just polishing on just an exterior of a Black Acura CL. It was absolutely shot to hell, but you have to get the job done right.
Scottwax is right, using a good LSP after polishing cuts down some time too. For instance, NXT, EX, EX-P.