<P> In July 2011, McDonald's announced that their largest restaurant in the world would be built on the 2012 London Olympics site . The restaurant contains over 1,500 seats and is half the length of an American football field . Over 470 staff were employed serving on average (during the 2012 Olympics) 100,000 portions of fries, 50,000 Big Macs and 30,000 Milkshakes . This restaurant will overshadow the current largest McDonald's in the world in Moscow, Russia . </P> <P> In January 2012, the company announced revenue for 2011 reached an all - time high of $27 billion, and that 2,400 restaurants would be updated and 1,300 new ones opened worldwide . </P> <P> In the middle of the decade, the restaurant began to suffer from declining profits . In response, McDonald's began to offer its breakfast menu all day starting in 2015 . At first, the launch was unpopular with franchisees who claimed that the changes caused service to slow down . However, the plan paid off with CNBC reporting that the company's fourth quarter earning "easily topped analysts' forecasts". </P> <Ul> <Li> 1937: Patrick McDonald opens a food and drinks stand called "The Airdrome" on historic Route 66 (now Huntington Drive) near the Monrovia Airport in Monrovia, California . </Li> <Li> 1940: Brothers Richard and Maurice McDonald move The Airdrome building 40 miles (64 km) east to San Bernardino, California, where they open the first McDonald's restaurant, near U.S. Route 66, at West 14th St and 1398 North E St., on May 15 . Its menu consisted of 25 items, mostly barbecue . As was common at the time, they employed around 20 carhops . It became a popular and highly profitable teen hangout . </Li> <Li> 1948: After noticing that almost all of their profits came from hamburgers, the brothers closed the restaurant for several months to remodel it and implement their innovative "Speedee Service System", a streamlined assembly line for hamburgers . The carhops are fired, and when the restaurant reopens it sells only hamburgers, milkshakes, and french fries . At 15 cents, the burgers are about half as expensive as at standard diners, and they are served immediately . The restaurant is extremely successful, and its fame spreads by word of mouth . </Li> </Ul>

When did mcdonald's start serving breakfast all day