Both bleach and fix go to completion. Frequency of agitation is mostly important for uniformity of processing and to bring fresh chemistry into contact with the emulsion. It is important to agitate, but not according to any particular schedule. I process the bleach and fix in room light by removing the tank lid and using a lifting rod in the reels to raise and rotate them periodically. Likewise within reason, the times are not important but you must process to completion for both.