It took me about 1.5hrs to do AIO/UPP on my car yesterday. I let the UPP sit for 2 hours after that, so then there was another 10 minutes to remove it. Then another coat of UPP 4 hours later, took about 10 minutes to apply, let sit for 3 hours this time, and then removed it - another 10 mins.
To do an actual polishing for swirl removal with the PC, it usually takes me a good 2 hours, sometimes more depending on the severity of the swirls. Sometimes you need more than one polishing step.