There are ways to recharge the activity of bleach, but they are usually reserved for large scale operations. Usually the colour film process, c-41 uses a sepaprate bleach and fix process. The paper process usually combines the bleaching and fixing - in the form of a 'blix'. It may be possible to use this bleach in a blix, but I am not sure this would be advisable for more than a one shot session. Bleach in working strength is usually quite long lived. So mix up just what you need to process your films, and keep the rest in concentrate form. I came across a few gallong of e-6 slide film process bleach a few years ago for freee. Since the bleach is the expensive part of the process, I have been using it for slide and c-41 films in 1L increments. The e-6 bleach is rated for 20 80 square inches worth of film. There were discussions on this site in the past that e-6 is a more active bleach than c-41, so it was ok to use both reversal and negative filme with e06 bleach, but not the oterh way around.
Bleaching is a process that takes place after all developer activity has ceased. Develop, stop bath, and a couple of good rinses to make sure all developer is gone, and you can bleach with the lid off the tank. If the bleaching time is say, 6:00, and the film is not visually bleahced by half that time, then by my set of guidelines, it is time to mix a fresh batch, and take the existing bleach and package it up to drop it at the HHW depot.
I am not up on the correct manual contents, but you should find all you need to know at this link:
http://www.kodak.com/global/en/business/retailPhoto/techInfo/zManuals/url]
