i wouldnt leave the lights on 24 for long maybe two weeks at the most, i have a medical marijuana growers bible that says shorter light periods promote females they sugest 14on 10off i personally use 18on six off they also say keep your room cool, soil warm with heatpad, give the plant a small dose of some thing with high nitrogen(n) low pospheris(p)for more females. it also says 24 hour light will cause the plant to show its sex, up to two weeks later than it should..