Catshark egg (Atelomycterus marmoratus)

I'm fairly new to this forum & wanted to know how many days do it take for this type of shark to hatch. The embryo is the length of the egg & is a few mm thick. I can see it's eyes & fins. Only had it almost 2 wks. Embryo was about 1/2 inch when i got it. Any advice or pointers would greatly be appreciated.