I feel as if it's taking a long time for it to grow in height but I love the fact that there are many sets of leaves before getting too tall. Plan is to wait until about 6 or 7 weeks before I top. Then when the stems start getting longer in length I'll do LST
Just keep it a little moist, not to wet. When it starts drying give the soil a spray. At this stage your relying on your leaves taking in moisture while the roots start developing.