For those of us remembering band class, "Early is on time, on time is late"
Unfortunately real life isn't band class. I used to get a bit annoyed when my work replacement walked in the door exactly on time. That usually meant by the time he was brought up to date and ready to take over, I put in an extra 10 minutes or so.
There was one time recently that being early did work to my advantage. A recent visit to Duke Medical Center allowed all tests to be completed early. Then rather than having to occupy myself for two hours to see the physician, she was free and saw me almost immediately. I was back on the road 2 plus hours ahead of schedule.