Simple mistakes 18. You're not home when the driver arrives. The delivery time might be 45 minutes, so you think you can run an errand and return before the driver gets there. The problem is that the estimated time is not an exact time. The driver can arrive as much as 30 minutes early with the ambition to get the pizza to you as soon as possible. It's not good to leave your house. The driver must make a return trip, your drive time is tripled, and it's not the driver's fault. Last updated: August 7, 2008