Hey Mike
First of all, welcome to the forum
When pollinated, Paph pods do not generally swell as dramatically as some other genera; they do swell, but slowly. It's possible that yours was pollinated... either by an unsuspecting insect, or well... who knows how else

Anyway, keep an eye on it. If it's not pollinated, it will probably not last much more than a couple of weeks. It does appear that there is some swelling at the proximal end of your ovary, but it's very hard to say without previous experience with the plant.
If it has been pollinated, it will continue to swell for a couple of months at least. How long it takes to mature depends on the species/hybrid... some take only a few months, some take up to a year. Whatever the case may be, keep an eye on it! You'll have plenty of time to learn more about orchid propagation before it's ready
- Matthew Gore