I commute with 26x2.1" Slicks. That's when I'm using my folder and throwing it on the train. 10 miles r/t.

When I'm riding the whole way in solo, it's 33 miles round trip and I ride 700x23mm on an old road bike.

I would definitely not choose the larger tire bike to do the longer version, although I take that 16+ mile ride home fairly often. 30+ miles/day pushing big tires around would take it out of me. I'm a teacher and need some energy throughout the day....