I want to add my 2 cents being a mushroom enthusiest and having just scoured internationak forums looking for kinshi specific recipes.
Generally when colonizing mason jars for fruiting itself, it takes anywhere from a few weeks to a month to fully colonize the outside, however I generally let it go at least one more week to make sure the inside of which i cannot see is also fully colonized.
Also for kinshi in japan they use additives to make their mycelial masses specific for larvae consumption quality.
They will add; wheat bran, glutamic acid, calcium, chitonase, soy protein isolate etc