Seems like a pretty short time, depends on the straing but the best is to check out the trich's, get a $10 radio shack hand microscope, you'll probably find that the trichs are still clear or maybe a little bit cloudy and you should let it go. I f you want a up heady type of buzz you want the trichs to be mostly all cloudy, if you want couch lock they should be mostly amber in color, if you want both then wait till they are half cloudy half amber.
If you harvest too early you will be greatly disappointed so you can't always go by the hairs. You spent this much time and effort might as well follow it through.
Good Luck!