Stretching Arista E6 development solution

Have a quick question regarding the Arista E6 kit.

Their instructions say 240ml of solution will process two rolls of 36exp 35mm film. These instructions seem to be oriented toward rotary processing tanks, where as I understand it it is possible to develop two rolls at one time in 240ml of solution.

But I'm developing in a hand tank, so would be developing one roll at a time. Do I apply the 4% additional development time 'stretch factor' to the second roll processed, or do I start applying the factor only for the 3rd roll onward?

It seems to me the hand tank equivalent to the rotary roll capacity would have me using the standard development time (X) for rolls 1 and then 2, then Y=1.04 x (X) for roll 3 followed by the same time (Y) for roll 4, i.e., only incrementing the development time after each second roll.

Rolls will be processed in rapid succession, so no worries about oxidation. I intend to 'stretch' process 2 times the recommended roll capacity, no further. So process 4 rolls from the amount of solution they recommend for 2 rolls...

Does this sound correct? Anyone have experience with using hand tanks and E6 chemistry?

Thanks!

Neil

Developer strength in the second run depends on how much silver it had to develop in the first run, and on by how much you dilute it with carryover water from an optional prewash. Therefore it may be hard to judge by how much you have to extend FD time for the second run. Some manuals state +15 seconds per run, yours seems to suggest some percentage. In the end you will have to start with whatever the manual recommends, and improve your personal process as you build up experience. If push comes to shove, some slides will end up a tiny bit brighter or darker than you intended, but they will still be usable for scanning and projection. If you are extra picky, think about running the more important roll in the first run, or think about running single shot, thereby foregoing 50% of potential capacity.

Tetenal says six rolls per batch. I normally develop 10 and once did 12. Never had any issues. You just have to extend the times accordingly.