13 weeks into flowering my sativa plants, how much longer?

Slushy green said:

Bigger light? Hps? I really can't afford anymore with this project .. I just wanted some good smoke, I'm hoping to get 5 to 8 ounces out of 2 4 foot plants.. Reasonable?

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Not to be a dick, but I really doubt you'll be anywhere close to that number.
Don't forget, Sativas can take up to 16 weeks or more, and the last few weeks is when you'll really notice the difference in weight.