While you may have 14 days to RESPOND, you do not have 14 days to begin your search - assuming your regulator is going to take a FinCEN FAQ as gospel.
From FinCEN's 314(a) FAQ:
3. How quickly must a financial institution respond to a 314(a) request?
Financial institutions must begin searching their records immediately upon receiving a 314(a) request. If an institution receives a 314(a) request during non-business hours or during the weekend, it must commence its search the next business day. If a financial institution finds a match with a named subject, the match must be reported to FinCEN. Unless the instructions to a request state otherwise, financial institutions must complete their search on all the subjects listed in the 314(a) request and respond with any matches no later than fourteen (14) calendar days after receiving a 314(a) request.[emphasis added]
"It is natural to give a clear view of the world after accepting the idea that it must be clear." - Albert Camus