I haven’t been to a Wal-Mart anywhere that had more than 4 registers open in the last 10 years. It is the main reason I seldom go there anymore.
7:30 to 8:00 a.m. is “optimum” shopping time for me. Earlier than that, not enough cashiers open. Later than that, too many people for the cashiers they do have open. I can also get a parking place fairly close to the doors.