When I articled, if lawyers or law students worked past 6 pm, they were welcome to dine at the firm’s expense, as long as they returned to the office to work after dinner.
That sounded like a great deal to a lowly paid student, and I was impressed with how considerate the firm was. Being a slow learner, it took me a while to realize that the firm was trying to encourage lawyers to work late into the evening. It took me even longer to figure out that the lawyers would often work until just after 6 pm, go to dinner until 7:30 pm, and return to the office just long enough to be seen by some partners, and then leave.