red or brown hairs

My bud has just gotten some red or brown hairs on it and I was wandering about how many weeks it usually takes after reaching this point on the plant? I have been vegging for about a month and a half and now flowering about a month and a half. Also I was wandering when the buds are supost to like double in size? Because im not sure if mine are the normal size they should be.

The hairs (Calyx) can change at different times for various reasons and do not always tell you when to harvest. Get a magnifying glass and look at the resin glands on the leaves and pistils. When they begin to change from clear<---white--->amber that is when you know to harvest. Clear = smooth White = slight harsh Amber = choker