During a road trip, I noticed that we had 3 hours and 15 minutes until our next stop. In my head, I thought, “OK. We’ve got about three hours left.”

Half an hour later, my son saw that we had 2 hours and 45 minutes remaining. He groaned, “Ugh. We still have three hours left.”

It was a strange phenomenon for me. As though we had made zero progress for half an hour.

So use caution when rounding. Do it too often, and it might feel like you’re not getting anywhere.