you want to flower for two weeks? or if you mean you want to stop budding two weeks early. Your buds wont be ripe, and not have nearly as much THC in them.

BTW you really dont have much control over how long a strain flowers. you can reduce the light to like 11 or 10 hours a day. it'll speed it up but reduce your yield quite a bit.

i've read some case studies of grows and for example
these are sea of greens

the first vegged for 2 weeks and got a total of 38G per plant
the second vegged for 1 week and got total of 34G per plant.

You can see that with that little vegging you dont get much per plant.
but if you've got a lot of plants its all good
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moral of the story. sea of green is a good fast way of getting buds