I work at least 2-3 more hours every day when working from home ~ 6 am - 5 pm. When going into the office I have to spend more time getting ready and drive almost an hour 1 way, starting work around 7:50. Plus when in the office going to the cafeteria to get food, go to the bathroom, run into people in the hallway, I'm away from my computer more than being at home.
This has been my experience as well. I can't understand why RTO is that important to cost the company so much in productivity, since I know a lot of people who would happily undersign this.