There are some ways it would be good for lunches to be longer, like giving students more time to eat, which would result in students actually having time to eat all the food they have. If they eat all their food, then no one will bring any leftovers into class, which can be distracting for them and other students, including the teachers. Also, some schools have very long lines for students to get their food, so students barely have time to sit down and eat. Besides, teachers would also get a longer lunch break to get what they need done.
As for the counter argument,