Just an FYI...some stores do not have the grill and fryer capacity to serve both breakfast and lunch all day long. Foods cook at different temperatures and different times, so you can't simply swap between the 2 functions on the grills and fryers, its a minimum of 10-15 minutes to switch from breakfast to lunch and back. This is why many stores don't serve breakfast or lunch all day long, they simply cannot do it and be "fast food". There's also the food safety they have to do on the food at their changeover times so they'd constantly have to be swapping back and forth on that as well.
Those who never have worked in the food industry have no clue how it all works and simply think you can just cook whatever whenever and it doesn't work that way. Stores that sell both all day, have the grill and fryer capacity to do so in the fact they have more than 2 grills and 1 fryer. Fries/hashbrowns for example cook in the same vats at different temperatures so you can't do both at the same time...I so wish our local store had split fryers like the one in another town close by have. meat cooks on different settings for different times than breakfast meats and eggs so you can't simply just cook whatever you want there either without waiting 10-15 minutes for the grills to either heat up or cool down to the proper temperature.