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“Business day” is defined slightly differently for Loan Estimates and Closing Disclosures.
For Loan Estimates, each day on which a creditor’s offices are open to the public count as a business day. Loan estimates must be delivered or placed in the mail no later than the 3rd business day after receiving your loan application.
For Closing Disclosures, a business day is defined as all calendar days except Sundays and the Federal public holidays The Closing Disclosure must be provided to you at least 3 business days PRIOR to loan consummation.