They look around 6 weeks to me..but Just to be sure...just use a 100x pocket Scope from radio shack $12. That will tell you the truth of where you are...ultimately it's rather important to find out ASAP, so that you can know when to start your flush. Unflushed happy tastes harsh sometimes...most times. If your trichs are starting to be more cloudy than clear you know it's time to prepare for the final weeks of it's life, if not then you know to just keep an eye out. I think the fact that your not sure of the strain demands the use of a scope...if your hairs are turning then it's rather mature, and your hairs are seeming to start to turn. Practically ALL of my hairs are still pure white, and I'll be entering four weeks on Sunday....get a scope man...they are freaking priceless, and WAY easier to use than it seems. Clear crystals mean not done, cloudy(Foggy glass) trichs mean almost done or pull for heady high. Amber trichs mean pull me I'm done or maybe too done. Ther should really be a mix of amber/Cloudy trichs. I like mine 50/50. Go grab a bag of your fav happy. And just check the trichs...you'll immedialty feel me. Either way good grow so far and good luck. I think it's gonna come out KILLER.