Hi Ultimate.. Give up on the window sill idea already! lol
If it works at all the yeild will be disappointing. ie. you will be lucky to get a few grams at best.
Your plant is surprisingly healthy looking otherwise. Bit stretchy and nodeless but nothing that can't be 'improved'. Permanent use of CFL lights will work much better than the window light and the environment can more easily be controlled.

I suggest you use 3-4 of those 23watt CFLs. I go against the grain recommending say 3 x 23Watt (6500K(Blue)) and 1 x 23Watt (2700-3000K(Red)).
Place it in an appropriate cabinet or box etc its up to you. You should allow for the plant to at least double or maybe triple in size. You don't want the enclosure too big though due to the CFL's weak penetration. Make use of as much close proximity reflection as possible. Layer the entire insides of the box with some shiny silver xmas wrapping paper. Spend a little time ensuring its safely adhered to last the warmish temps of at least one entire grow. It's by far the best cheapest version of mylar. Do not use foil. It doesn't work well, tears easily and makes a lot of noise.
You will also need to cater for use of a small fan and the appropriate ventilation/fresh air to keep the temp from getting too high. It should be a fairly small low temp environment so you won't need to do alot.
Keep the lights close to the tip/s and major fan leaves. 1-2 inches approx where possible. Continue LST'ing when appropriate until the developing buds become fairly 'pronounced'. Don't clip any leaves off because they all act as solar panels to deliver the entire branch and tips/buds their energy.
Ensure 12/12 lighting with a 24hr timer and keep it as close to pitch black as possible during the dark period. Feed, water/drain, house and light the plant correctly using a slightly modded version of things you already probably have and are doing. IMO you could stand to get up to an ounce or so from this particular soil grown plant if all went well.

Side note : If it were me I'd cut the top off and stick it in perlite to root. Then rig up a very basic soiless medium solution. Plant vigour, health and yeild from a simple hydro setup with CFL lights is dramatically better compared to soil. It's great fun and you can expect more like 3-4 ounces of surprisingly large dense nuggets using only 90-100Watts of CFL.
elcheapo Reviewed by elcheapo on . Nub Grow Inside, any comments Hey everyone, this is my first grow, and it started off under 23 watt cfls and then i decided to put it in my window sill for 12/12 any comments.... Does anyone know how soon it would be before I start seeing gender for the plant.... its bagseed which was planted on April 1, so about 37 days ago Rating: 5