Hi. I'm pretty new to the mantis game and have never seen mantises mate and I can't find anywhere how long it usually takes them. I have two ghosts and they have been going at it for just about 20 hours now. The male has been on her for that long anyway. I'm worried after this length of time, before too long the female will get fed up and kill the male. You think should try to separate them or just leave them alone? Is this a normal length of time?