A smile goes a long way
You'll meet some interesting, friendly, funny people on this job, but there are some who react to everything with attitude. It seems trivial, but something as simple as a smile can help diffuse tension.
You actually have very little to do with the time estimate
Most of the time involved with a food delivery is taken up by actual cooking, so if a place guarantees that it can get the food to you in 30 minutes or less, that’s most likely a reflection of fast cooking rather than speeding delivery drivers. Or an unholy combination of both, in which case... there might be some mishaps.
The food is irresistible to you, too
Can you imagine being cooped up in a tiny sedan with a container full of piping-hot pizzas, subs, fries, pad Thai, soups, etc. for hours on end? Sometimes, a fry might “accidentally” fall out of the bag. And right into a waiting mouth. Man, these roads sure are bumpy, huh?