According to the Clerk of the Circuit Court the process goes like this:
A foreclosure sale occurs. New owner gets title in 10 days. They can get a writ signed by the clerk. That is taken to the Sherrif's office. The sheriff posts the writ of possession within five days they, and five days after that the former owners are suppose to be out. It depends on how quickly the new owner moves.
In this market there is no specific time-frame. Typically the bank will contact the homeowner and let them know. Once the home is sold the homeowners would have to vacate or be evicted.