premise: The 2015 J&T Banka Prague Open was a professional tennis tournaments played on outdoor clay courts. It was the 6th edition of the tournament which was an International tournament on the 2015 WTA Tour. It took place at the Sparta Prague Tennis Club in Prague, Czech Republic, from 27 April to 2 May 2015. This was the event's first edition as a WTA International tournament.
hypothesis: The J&T Prague Open lasted for more than a week in 2015.
reason: The tournaments only lasted for 6 days. I think that the system was unable to calculate the time frame.