My experience tells me there is nothing unusual with this clip. The retraction on both sides is symetrical and smooth as needs be, the times will depend on the pressure and flow rates of the ground source, plus of course any internal hydraulic leakage of the components. The gear operates only on the Centre hydraulic system and an idea of the timings using the aircraft pumps can be found in AMM 32-30-01 P 508 fig 502.