1000w xj13 grow

Just picked up Xj13 from harborside I'm using a 1000 w light with a 4x4 ebb n flow tray with hydroton. I'm using 12 its spativa I was wondering how long do u think I should veg I don't reallywant them to get to tall maybe 2 1/2 ft the most any help would be appreciated if u grown this strain before thanks
 
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