I have been breeding Catocals for more than 30 years. They can easily be kept alive for 2-3 months. By species. Feed adult butterflies once every 2 days. I still have a cage with laying C.fraxini at home. They have been alive for 10 weeks now. If you are interested, I can send a photo. In Catocal females, eggs are gradually formed. They are laying gradually, it cannot be accelerated.
Regards, Habal
