How long does it take for follicles to grow from 10mm to 30mm+? Is there a common timeline or do females develope at different rates? I think it was Brian Barcyk who said he uses an ultrasound and aims to pair females at 10mm, 20mm and 30mm. I'm not good at feeling for follicles, so what is the longest I should go between pairings for snakes who give me locks everytime I pair them? I don't want to make my males do any more work than I have to since they are locking for 24+ hours anytime I introduce them, and they've stopped eating.