Reg CC does not put a limit on the number of days you can hold an "other check" when it's deposited into a new account. That is set by bank policy. Ours is 11.
The maximum umber of days you can hold a check is 7 days, with the exception of new account holds. For new account holds, next-day items (the amount over $5,000) can be held for 9 days and other checks can be held as long as your policy allows.
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Don't make me say, "I told you so!" Sincerely, your friendly Compliance Officer.