How long does it take to review a video tape?

It's now been nine days since Columbia University reluctantly handed over surveillance tapes to law enforcement authorities. These tapes (hopefully) will show who hung a noose on a [black] professor's office door.

How long does it take to review such a tape? 'Cause in the meantime there are still opinion writers out there who would like you to believe that a single confederate flag-hanging racist a-hole is indicative of the larger picture -- not only on college campuses, but in the US at large. If the Columbia incident is revealed to be a hoax, will there be as much media coverage about it? Or will it be conveniently forgotten like the incident at George Washington University?