Right to Financial Privacy Act
Sec. 3411. Duty of financial institutions
Upon receipt of a request for financial records made by a Government authority under section 3405 or 3407 of this title, the financial institution shall, unless otherwise provided by law, proceed to assemble the records requested and must be prepared to deliver the records to the Government authority upon receipt of the certificate required under section 3403(b) of this title.
Generally, the certificate and the documents are exchanged in a "barrelhead" transaction; i.e. you get the certification when they get the documentation. As noted above, your bank's job is to begin working on the request as soon as you receive it. Telling the feds how long they're going to wait on you is a misallocation of courage - they will eat you alive.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.