Original sentence: United States stations typically broadcast local news 3 or 4 times a day: around 4:30, 5 or 6 am, 11, 11:30 am or noon, 5 or 6 pm, and 10 and/or 11 at night
Edited sentence: United States stations typically broadcast local news 3 or 4 times a day: around 4:30, 5 or 6 am, 11, 11:30 am or noon, 5 and/or 6 pm, and 10 and/or 11 at night