Ready to Flower? Growing on a schedule![pics]

Hey Guys. So I'm a first time grower on an extremely limited budget. Here's what I'm working with:

-2 parallel 8 foot 60watt fluorescent ceiling lights lit 24 hours
-15 indoor plants, 10 shwag, 5 kb, all sprouted March 9(1 month 4 days ago)
-Fan hanging at one end of the plants blowing continuously
-Generic Lowe's Flowering Plant soil
-Attic temps range from 60-75 at night and 75-100+ during some days
-Plants suspended precariously from twine in my attic so that I can lower them when need be.

Here's my question. I leave town on July 30th. That's a total growing time at MOST of 4 months and 20 days or so. I want to grow these with nothing more than water if possible(I just don't trust chemicals) and the fluorescents because I can't afford extra lighting.

As you may or may not be able to see in the pics below(I couldn't quite get the angle right on the shots of the nodes), the pre-flower leaves are starting to develop and the plants are healthy and happy.

I don't care how much weed I get, I just want this to work! My plan was to switch over to 12/12 at the end of this month, leaving me a full 3 months of flowering.

Should I be worried? Can I make this happen?

sorry to bump

I know people have good advice on here!

top them first so you can have two heads on each and then i would say throwing them in to flower on the 20th of next month because they dont need 3 whole months for mine normally. then if the new heads grow in fast enough you might be able to get a another top in again. just dont top them unless they have the little leaves developed enough but by the time this is posted the pics you showed should have the little leaves developed enough. But yeah i topped mine all along the way up untill flowering and now some of my plants haves six heads and they are only 2 months and 2 weeks old, your going to get alot more weed if you top them. i dont know but if you top them twice i think that shouldnt take too much time where you might over shoot the deadline.

those plants are ready for 12/12 now, I would start it immediately... That should give you plenty of time. Then youll have some bud to smoke while your out of town