Wipe and washing system: liquid consumption

Hello together, I have the feeling that I have an enormous wischiwashi water consumption (XC60MY09, Xenon). In the operating manual this is also a hint about the high consumption in connection with the headlight washing system. Supposedly this should therefore only be activated every 5th time. However, I have the impression that the system is activated much more frequently. Is there a difference, for example, whether the washing function is pressed only briefly or longer? Will the meter for the Resetting alleged 5 cycles when activating the rain sensor, or letting the windscreen wipers wipe regularly? What experiences have you had with it?