I can really see the Sativa influence on the elongated leafs' so your probably looking at a minimum of 90 to possibly 120 days and why I stay away from the Sativa Dominant Auto's.. I shoot for 70 to 80 days max on most strains with 75 being my goal.. Your plants do look healthy and have plenty of flowering sites, but with the limited lights your running I think after all the time and hard work your putting in you might be a wee bit disappointed in the end product being such a small harvest.. you can pick up a 400w setup very cheap, I got one for $90 and your power bill will not suffer much at all, maybe an extra $25 a month is all and the difference in your harvest will be 100x's better.. think seriously about this or at least go with some T5 HO Flouros, even that would make a huge difference.. best of luck