(Photo by Andreas Rentz/Getty Images)

Read: Which Is The Fastest Line In The Grocery Store - Julie Devereaux

As you head to the grocery store to pick up those last minute items for your holiday dinner, you'll be needing this this weekend! (though it does require some math!)

How to Pick the Fastest Line at the Supermarket

"Every person requires a fixed amount of time to say hello, pay, say goodbye and clear out of the lane," he said in an email. His research found all of that takes an average of 41 seconds per person and items to be rung up take about three seconds each.