Some brews can take longer/shorter, depending on the amount of malt/sugars in the mix, temperature, yeast etc.
I normally leave mine in the primary for 3-4 weeks for the sediment to settle. As long as the temperature isn't too warm, the yeast isn't likely to go off. (Why winter is a good time to brew).
So, you can safely leave it in the primary until the airlock equalizes (water level same in the inner/outer lock), and then bottle within 3 days...
Saves you having to transfer to a secondary (unless you're kegging), and contamination thru excessive handling/exposure.