QuickBooks Payroll does not offer 24-hour support. Typically, their customer service hours are during standard business hours, which may vary based on your location. For specific queries, it's best to check the official Intuit website for the exact support hours. They provide various support options, including phone # 1-855-200-0590 or +1-855-200-0565, chat, and email, allowing you to get assistance when it's most convenient for you.