Until the Thrics start to turn amber, it depends on the strain as to how many weeks. Once the plant has a few leaves, we will be able to tell what it is, Sativa or Indica. If it's bag seed you no one will be able to tell you how many weeks it will take. Some people have had great plants from bag seed but, I've always figure if they didn't know how to not get seeds, they didn't know what they were doing so most likely, it's crap. Just my opinion and again, I know there have been some great bag seed grows.