I think the wash cycle takes too long.
Do not attempt service or replace parts of the appliance unless referred to in the owner's manual. Follow all safety precautions provided in the owner's manual.

Different wash cycles have longer or shorter wash times. Refer to the Owner's Manual for the appropriate wash cycle to use.  
 
Some models have the ability to heat the water (Wash Temp Boost or Rinse Temp Boost options.) If the incoming water temperature is low, the wash cycle will be extended to reach the proper temperature.