harvest time question

i may run intot some time constraints as far as harvesting. As of now, the plants have been under 12/12 light for 1 week, but i may need to harvest them when they are about 6-7 weeks flowering. What, if any would be the concenquenses of harvesting the plants early. also, can anyone give me a ballpark estimate on 2 plants grown from bagseed under (4) 40W flouro tubes. i know its really hard to say without more info, but im just looking for an estimate. thanks

anywhere from 6 to 9 weeks bro, If you harvest to soon it will taste like shit and not give a very good buzz bro. doesnt look good for ya man

I estimate 10-20 grams dried bud. Don't expect much, you not giving it enough light or time.