You answered your own question. If the water is only dribbling in very slowly then it will obviously take a long time to fill. Fix the water in fault. Remove hose from back of machine & point it in to the sink. Turn tap on & confirm there is good water flow. Then check the filter in the back of the inlet valve is not blocked. Put hose back on to inlet & try filling. If still very slow then replace the inlet valve with a new one.
Lincoln Appliance NZ, August 2016