Below is a cut and paste from Jobo instruction sheets discussing development times:
JOBO: If you do not want to use a pre-rinse, you will need to determine the appropriate developer time for each specific situation. Rotary agitation affects different film and developer/dilution combinations to differing extents. Some developing times may be essentially the same, while others are significantly shortened or even extended. As a rough guide, try shortening the developer time by about 15%. This could vary by anywhere from about -25% to +10% from the original 'hand process' (intermittent agitation) times. A five minute 'pre-warm' is recommended when foregoing the pre-rinse. This time allows the film, reel(s), and tank to stabilize at the development temperature, before the developing begins.
I read this as saying if you use a pre-rinse you do NOT shorten the development time from the 'hand process (intermittent agitation) time but you MAY find an adjustment necessary due to the film and developer in use. And if you do not use a pre-rinse you should expect to make an adjustment in time from -25% to +10%.
This is contrary to my understanding of using a Jobo. I am under the impression that you ALWAYS shorten the development times by 15% (as a first step) whenever using the Jobo system with a pre-rinse.
I never questioned this as I thought continuous rolling would produce results sooner than intermittent agitation.
Do you read this as saying when using the Jobo system and pre-rinse, it is not mandatory to adjust time from suggested "hand process" times supplied from the film manufacturer?
Thanks, in advance...