Tropicals & Tender Perennials: Question on seed pods, 1 by Roybe

Roybe wrote:
I have two hoyas growing together in a hanging basket. H. pachyaclada and H. subquintuplinervis, they have both just flowered together and to my delight they both have a seed pod. I suppose it is possible they may have cross pollenated. These are my first hoya seedpods, so i'm open to any tips to growing from seed. They are both about 12mm (1/2 inch) at the moment. I'm not sure how big they get before they are ready to open. Any info would be appreciated. This is H,pachyclada.

Thanks Roy