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When referring to initial and closing disclosures, this is the difference between a "general business day" and a "Specific business day".
What is Saturday? Loan estimates must be delivered or placed in the mail within 3 business days of application. (You don't count Saturday as a business day for the loan estimate) The closing disclosure must be delivered three business days prior to close. If it is delivered in person, you may close 3 business days later. (You do count Saturday as a business day for the closing disclosure) If it is mailed, it is received three business days later, and then you can close 3 business days after that.