The manual states the re-use rate of the developer, by increasing the time after x number of rolls per litre (think it's 4 rolls per litre, then time increases to 3:30 iirc).

Blix yes, it does have a lot more life than one shot, but increase times. Also, you could replenish the Tetenal developer with the Kodak replenisher, using the Kodak replenishment rates. But the developer is the cheap part anyway.

If you're doing Jobo rotary, I would one-shot the developer.