Hi Roam, I had the same problem like you. What does it meam 1-minute agitation? Tetenal gave me this answer: 3 sec agitation rythm means one inversion every 3 second. 1 minute agitation means: fill the developer into the tank and dump the tank onto the table to remove air bubbles from the film. After that inverte the tank once and then o n e inversion of the tank after every minute.(posted 9147 days ago)-- Dietrich look at www.tetenal.com, you will find detailed tables on the developing times of various films in all TETENAL developers