Jim,
I am incorrigibly tardy. In my time, I have been 45 mins late for my undergraduate admissions interview, missed a university exam because I arrived too late to be admitted to the hall, missed countless flights having arrived at the check-in desk only minutes before the plane was due to take off, and turned up 30 minutes late for my D.Phil. viva.
I often pay for guaranteed next day delivery of my Listener solution, because i forget to post it until the day before the deadline. This time, I was slightly more disorganised than usual.