IRS will issue most refunds in less than 21 calendar days.
The IRS expects the earliest EITC/ACTC related refunds to be available in taxpayer bank accounts or debit cards starting Feb. 27, 2018, if these taxpayers chose direct deposit and there are no other issues with their tax return.
2017 Tax Season Refund Frequently Asked Questions
https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions
