When 1 hour becomes 20

I went to a 1 hour dry cleaners this afternoon at 2pm to get a suit drycleaned. However they were unable to accept it for 1 hour cleaning and the earliest I could get it back would be 10am tomorrow. If I had wanted 1 hour cleaning I needed to have had it dropped off by 1pm. What I can't understand is the shop closes at 5 at the earliest so that still gave them 3 hours between arriving at the store and them closing for them to clean the suit and they were advertising 1 hour.