Is Marriott customer service 24 hours a day?

Yes.

Marriott’s 24-hour “at your service” customer service specialists provide guests with all-weather, high-level personalized services. The hotel has 2,500 square meters of advanced banquet and conference space, and an 800-square-meter column-free grand banquet hall with a floor height of 6.7 meters.

Marriott, the full name of Marriott International Group, originated in 1927 and was founded by the late Mr. Willard Marriott in Washington, USA.