For me it was was 7-10 days. I was say they held the fry in their mouths for 4 days. Eggs in the mouth for 2-3 before they hatched. And even when the egg sack is gone they parents held em occasionally too.
Maybe because I had lots of fish in the tank and they didn't feel safe to let them be out. Would likely be less mouth brooding time if just the pair by themselves imo.