TurboTax customer service/support is open 7 days a week during tax season.
Use the following TurboTax website to contact TurboTax customer service/support. Support is open from 5am to 9pm Pacific time (8am to Midnight Eastern time) daily, during tax season. Submit your question/problem during business hours and then use the option for Call (a phone number will be provided for Call) to speak directly with a TurboTax agent -
https://support.turbotax.intuit.com/contact/
Note: The Call option will not be available when TurboTax Support is closed.