Fast-food chains are extending their hours to feed the 20% of all employed Americans who now...

|By:, SA News Editor

Fast-food chains are extending their hours to feed the 20% of all employed Americans who now work at night and help wring more sales out of their existing restaurants. At McDonald's (MCD), the hours of midnight to 5 a.m. are the fastest growing time segment in its U.S. business. Dunkin' Donuts (DNKN) has doubled its 24-hour restaurants in the past 10 years.