How long direct deposit takes between IRS and bank?

If you requested your refund be direct deposited, it can be as quicly as 10 days after you file your return, or it may be longer. Most banks credit the account as soon as the ACH, which is the banking term for the direct deposit, is received at the bank. ACH's are electronic funds transfers. Think of it as sending an email with a cash value to a friend. The ACH will have specific directions on which account to credit, how much to credit, and on which date to credit it.