The Sidekick does not do a wash step between developer and bleach. (For this reason I am skeptical about reusing the bleach, but that is something to look at later after I get C-41 and 4-bath E-6 up and running.) However it DOES DO A PRE-SOAK before the developer. This is because the Sidekick doesn't have any tempered water bath. The pre-soak appears to be set to heat up actually a few degrees higher than the developer is calibrated to in an apparent effort to compensate for the cooling of the reels and film. (I know PE and others say to use two quick prewashes for this reason.) The drum has a temperature sensor inside of it and there is a hot air blower that blows hot air on the outside of the drum during steps to maintain the temperature of the chemicals in the drum. My current thinking is that because of the pre-soak the developer does take longer to get into the film. (As is the case for black and white.) Since the temperature is higher though it might be less of a difference, but because their are three+ emulsion layers perhaps it is actually more significant. Unfortunately if that is the main source of the issue that there will be some variation from film to film stock to film stock. There is also the issue of how the 3:15 is timed in terms of filling and draining the drum.
If the control-strip density values plot within the processcontrol limits for LD and HD – LD, you do not need to adjust the developer time. If the LD and HD – LD parameters plot significantly low (out of control limits), then increase the developer time slightly on each subsequent process run until the control-strip plots are in control. Usually an adjusted developer time that produces good control-strip densities falls somewhere between 3:15 and 3:45.