I vacuum pack my Caerphillys after the desired amount of rind has formed, so anywhere from 1 to 3 weeks. I've found that with raw Jersey milk the rind seems to develop a more intense and pleasant flavor, so I'll let them go 3-4 weeks until I get a bit of a white powdery look (maybe wild Geo?) to them. With P/H milk I let them go for a week in the cave, then vacuum pack. I've not had any issues with whey coming out.