Walmart is a popular retail chain store in the United States, and they typically have extended holiday hours during the Christmas season. The store hours may vary depending on the specific location and the day of the week. However, as a general guideline, Walmart stores typically open around 8 a.m. or 9 a.m. on Christmas Eve and remain open until late in the evening. It's best to check the Walmart website or contact your local store directly to confirm their specific holiday hours.