I have found an old roll of 616 film in my Grandfathers folding Kodak camera that has been exposed. It's on an Ansco spool, but no clues to the film manufacturer. All I can see is the brownish backing paper that says "exposed".

Any guesses as to a development time? I was hesitant to do a clip test since I don't want to cut an image in half. I have some benzatriazol to use as a base fog inhibitor, so any suggestions as to amount to use and developer/time combination would be appreciated.