The answer is....
RT, the answer is......
I decided to call the local FAA here in Little Rock. After speaking with the supervisor, she indicated most TFR's (Temporary Flight Restrictions) are updated as information is available. For POTUS and VP, the White House will usually wait until 48 hours before a specific visit in the U.S. before releasing the information to the FAA. Other visits for VIP's are released by the State Department or another agency a few days when schedules are confirmed. She said it depends on the individual visiting and the security necessary for them.
Also, she mentioned that the AOPA (Aircraft Owners and Pilots Association) has a good graphic map of TFR's, but added their information comes directly from the FAA web site.
On a personal note, the last POTUS visit here to Little Rock, GWB, was interesting to listen to. The TRF was active about 30 minutes before the arrival of AF One. There was a specific squak code required for any aircraft flying in the restricted airspace, otherwise the CAP jets would be on them like bears on honey. The airport was closed to all air traffic, incoming and departing until after he left the area and again upon his return and departure. I have never heard the CAP fighter comms, but just listening to the local airport air frequencies was very interesting and informative. The SS was staged at locations on the field and runway and in constant comms with the tower. All comms were AM and in the clear. Listening to Memphis Center helped determine the arrival of AF One as they were handed off to local controllers.
Hope this helps. I was glad she was open with the discussion but she did make the comment that was about all she could tell me since this was basically public information anyway.
David