I did about 100-150 UW questions per day. I would finish my blocks of 50 questions in about an hour, so doing questions would take me 2-3hrs depending on how many blocks I did.
After that, I would quickly skim the educational objective of the questions I got right and fully review and take notes on all the questions I got wrong. This would take about half an hour or so per block, depending on how many I got right/wrong.
I don't think there's much you can do to go faster because I think reviewing the questions is just as important as doing them. Maybe if you only review the questions you get wrong.
Good luck with your prep.