Brian is correct. With a "true" divided developer, no development takes place in bath A. The developing agent is absorbed. It is then activated and exhausted in bath B. Time/temp are less meaningful in that context although they can still potentially make a difference in how much developer is absorbed and whether or not development in bath B is truly to completion. TD-201, on the other hand, is not a true divided developer. Development takes place in bath A, and is then completed in bath B. Time and temperature and agitation matter.