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1/2 pint PF substrate jar about 23 days after inoculation. The primordia have appeared and it is now time to birth the cake. Wait until you see this, and the fruiting will be maximized.
-PF Tek

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Within 5-10 days (with certain mushroom strains it can however take up to 30 days) pinhead-size accumulations of mycelium should form. These so called pins represent the beginning of mushroom growth. In the following days also small mushrooms with brown heads become visible. Now it?s time to birth the cake into the fruiting container where the mushrooms can develop to maturity.
-PF Tek for Simple Minds

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Once a cake is completely covered in white mycelium, wait at least 1-2 more days before taking the cake out of the jar.
-Simple Cubensis Grow Tek

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Full colonization of a PF jar can take anywhere from 2 to 5 weeks, depending on your own factors. It can vary widely, so don't use these as scripture when evaluating your own setup. A good rule of thumb to determine full colonization is the time it takes for all the sides of the jar to become covered with mycelium, and wait 1 week after the outside is fully colonized. This will allow for the inside (which has less access to CO2release/fresh air) than the outside layer does, and takes longer.
-PF Tek FAQ: Incubation through Birthing

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Cakes will often slow to a halt when they have only a small part of substrate to overtake. When I reach this point, I often birth the cakes even if they're not totally colonized. Just make sure to get as much of the substrate off as possible, or you'll waste nutrients with unnecessary mycelial growth, and you'll run a greather risk of contamination.

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