It is not uncommon for paphs to hold the flower for many months, ive had some in bloom soo long i got sick of looking at them and cut the spike. And have cut many spikes so the plant could rest after blooming for many months. As long as the environment is kept at a pretty consistent temp and humidity flowers of lots of orchids will last a long time.
That paph you have there is very nice and a real easy one to grow, the species will be much more challenging. It should reward you with flowers on a pretty consistent basis.