Mine about 5-6 hours /25l, still don't know why this is as it should also be in the 3 hour range
probably the pressure in your taps is a bit low clinton
2 to 3 hours sounds right
clinton, mekaeel is right in saying perhaps your pressure is not correct (4 bar)
or you need to change your filters .....or your membrane is blocked....possibly needs to be flushed or replaced............what is your t.d.s sitting at present?
maybe i can do some troubleshooting...........by the way....how was isle maurice???