I tend to run about 10 minutes late every day. Fortunately out of 4 people in our department one guy is always 5 minutes late, my boss is 15 minutes late, and the last guy gets here 20-25 minutes late. So I fit right in.
I don't like running late and I try not to abuse it, but I run a business on the side which keeps me up all night and I'm a very deep sleeper. This morning I woke up after the two cell phones and two alarm clocks right next to my bed had been going off for the past 40 minutes.