I have four larvae of this species now, two huge ones, and two slightly smaller ones. If you look at my other thread with the pic, you can get a good size comparison.
Anyways, I collected the first larvae a month ago. He has been building very sturdy structures, I assume they are pupal cells, not some random hole. Just got the other ones today, not sure what they are doing, their container is huge, more than a foot wide, maybe 10 inches tall, so I cant see them very well. When should I expect them to pupate, and how long will their pupation stage last?