Wolfram,(posted 8816 days ago)The 15 rolls per liter comes from the Kodak data sheet on Xtol. That was what started me asking.
The development chart lists the time to develop based on fresh (or one shot) developer. The chart on using the dveloper over requires an increase in time for more than 5 and more than 10 rolls.
I was trying to see if anyone had tried the longer development with less developer. And considering how everyone cites underdevelopment, apparently not. If you take a film that is supposed to go 7 minutes with fresh, using only 70 ml would take 9 minutes 15 seconds according to Kodak. So developing for 7 minutes WOULD give you underdevelopment.