My flowering with the Strawberry cough was a long one, about 10 weeks, but a great way to tell when their done is to get a cheap microscope (You can get a hand held one at a walgreens for $15). And look at the Trichromes(The THC crystals). If they are clear, they are not ready. If they are cloudy and milky, they are almost ready. If you start to see them getting brown in the little balls on the top, that is about when they are ripe. But people say there are different highs depending on when you harvest it. So try harvesting some when they are cloudy, some when they are half cloudy and half brown.