The IRS states that most refunds are received within 21 days from the time a return has been accepted. Once your Federal return has been accepted please, wait 24 hours before looking it up at the IRS Where is my refund? site.
See this FAQ When will I get my IRS tax refund? for more information when you can expect your tax return.
Please note: The IRS will not start processing returns until January 27, 2020. Some returns will be processed up to a week prior to this date for testing purposes. If your return is among those that the IRS processes early, your tax refund will not be processed until January 27.