John, one of the advantages of home developing is the quick turn-around -- I am reluctant to "batch process" the film.
My experience with E6 is that the concentrates last a fairly long time if you use the chemicals one-shot (mixing before use), as recommended by Kodak with its 5 liter kit (I have 7 of them). I started on my first Kodak kit more than a year ago and the results are still good -- the developer, after being mixed, has the light brown color indicative of good solutions. I have heard lots of anecdotal evidence that the C41 chemicals also have fairly good longevity after being mixed. Certainly, my RA4 (Kodak) chems have lasted more than a month after being mixed with little obvious deterioration.
Last edited by warrennn; 08-22-2011 at 06:25 PM. Click to view previous post history.