About how long does it take for pansy seed pods to dry up, and ready to be harvested?

I have some pansy seed pods growing(pure yellow, white, purple, blue and yellow, red and yellow, white and purple, and more). I have about 15 pansy plants total. Atleast 3-4 of the pods are about half the size of my pinkie nail, and are very light green. I have let them grow without pinching them off for atleast 3-4 weeks. About how long does it take for them to dry up?