Hey, I pressed pause and came back to the game after dealing with somethign irl. I then pulled out the pizza I had made promptly for the first customer of the day in great time, and got a "0%" waiting, so I suspect that pause isn't actually pausing the timer for customer wait.
There should really be save points so that you don't start completely over when you die. It is very dull very quickly to redo the first level when you're significantly into the game.