The QuickBooks Enterprise support phone number is 855-200-0590. This number connects you directly to Intuit's support team, who can assist with various issues related to QuickBooks Enterprise, such as installation, data management, troubleshooting errors, and more. Regarding availability, QuickBooks Enterprise support is not typically available 24/7. Intuit's support hours usually cover standard business times, but specific hours can vary. It is advisable to check the official QuickBooks support website for the most up-to-date information on their support hours or to call the support number to verify current availability. For urgent issues outside of regular support hours, you can explore the QuickBooks online community forums, knowledge base articles, and other self-help resources provided by Intuit.