Answer:
The waiting period will begin on the third business day after the closing disclosure is mailed.
Step-by-step explanation:
The closing disclosure is a 5 page form that your mortgage lender must send to you. It includes all the relevant information about the loan that you applied for, e.g. estimated monthly payments, closing costs and other fees, etc. But the closing disclosure doesn't mean that the loan has been approved, it is a formality prior to closing the deal.