For what it is worth - there is no definite time to mature a seed pod. There is a range, but each time it is done it will vary.
I have the most experience with Phrag besseae. Back in the 1990's I had 8 different clones of besseae and tried to make more besseae with all 8. All plats were in the same growing area (same temp, & light). One plant went to dry seed in 12 weeks, most went to dry seed in about 20 to 30 weeks, one took over 40 weeks. Each year the time required varied, probably due to temperature, light and maturity or vigor of the pod parent going into the process. The clone that matured its pod in only 12 weeks the first time, was consistently the first to mature its pods, though the length of time would vary from year to year. Similar with the others, each clone seemed to have its own rate at which it matured seed pods.
So in my experience - those tables which list the time required to mature a seed pod are merely approximations. Health of the plant when the pod is set, temperature and light will strongly influence the time required. The best route is to observe, and take notes. You will see changes in the shape and color of the pod as it matures. In the week before splitting, the seams of the capsule will become pronounced, the shape of the capsule will change, and the color will begin to change.
Hope this helps.
