The past 2 weeks have shown explosive growth. I topped the plants this past week and am planning on inducing flowering next week. Fortunately no males (fingers crossed).
@CanadianFillmore, thanks. It's the one plant in the corner which is/was growing heads and tails above the others. Got feminized seeds from second-hand vendor, so I'm curious myself. Most are 3-4 feet, except for the 3 5+ footers