Trust me, you'll grow quite fond of your worms. It may be happening already.
One inch is about the size where they begin to pupate. As long as the larvae have plenty of substrate to eat, they will only pupate gradually. If you allow the frass to accumulate and once it becomes greater in volume than the edible substrate, then the larvae will pupate like mad.

One inch is about the size where they begin to pupate. As long as the larvae have plenty of substrate to eat, they will only pupate gradually. If you allow the frass to accumulate and once it becomes greater in volume than the edible substrate, then the larvae will pupate like mad.