A maximum of 5 wash cycles per day is recommended because in comparison to more expensive commercial models, this one is still rather slow. This machine is not flexible and fast enough in a commercial environment where more washes per day are required. After all 25 minutes is still rather long in a commercial kitchen where most washes are done at the same moment of the day.
Louis is correct. Those units he is referring to are "tank style" ware-washers that are 90 second cycle machines. Items loaded in those machines must be thoroughly prerinsed before loading in the machine. The ProfiLine units are "fresh water" machines that fill with fresh water, then drain for each segment of the cycle and operate similiar to residential units ... on steroids. They require no prerinsing.
There are two lines of 24" undercounter Pro dishwashers: those that are being discussed here (suitable for smaller offices etc., residential racks, 50 gallons/minute recirculation, made for 7,500 operating hours) and then there are those which can accept regular racks or plastic ones, recirculate 106 gal/min and are made for 15,000 operating hours.