Paph flowers will last as long as they want to. Conditions can play a big part, size of plant and roots. Maybe they were too wet or too dry for a time.
Did they get too hot or too cold. Its a bit like "why won't my orchids flower"
I've had one of the best flowerings of paphs this year that I've had for a while and from previous years some flowers didn't last as long as they had before. Its a question that will attract a different answer from most growers I think.
I agree! Welcome Doug!
Ramon