How long can you go before you have to pick-up and check your smartphone?

Another restaurant in New York City hired a consultant to figure out what was causing an increase in dining times and a decrease in customer satisfaction, only to find out it was the customers that were the source of the problems. They spend too much time ogling at their smartphones which slows down the whole-eating-food-thing.
Have you ever challenged friends to see how long you could go without picking up your phone? Some say the average user can’t last longer than six minutes. What's your record?

source: CommitStrip