What business days does the IRS issue refunds?

Does the IRS have certain days that they issue refunds to automatic deposit accounts?

After you file

The IRS states that they issue most refunds within 21 calendar days, so that does include the weekends.

For additional information please follow the link.
2017 Tax Season Refund Frequently Asked Questions https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions