In the November Visa Bulletin, the Department of State (DOS) provides its prognosis on the likely availability and movement of visas for the next few months:
For Family (Worldwide) Categories: F1, expected to advance three to six weeks; F2A, three to six weeks; F2B, one to two weeks; F3, one to two weeks; and F4, up to one month.
Please see full publication below for more information.