If chronic lateness has taken over your life and turned into a defining trait of who you are, it's likely that you're losing out on job offers, recreational opportunities, friendships, and more.
All thought of the lateness of the hour apparently forgotten, he hurried around his desk, took the bottle with Slughorn's memory in his uninjured hand, and strode over to the cabinet where he kept the Pensieve.
As it's our friends who often feel the full force of our lateness, most friendship groups usuall have that person who is known as being 'the late one'.