Lighting and later on Sexing my little plants

Well I planted a few germinated seeds about 2 days ago and their already about 2 inches tall.. I was just wondering if while in the vegetative state if it will be ok to leave the light on 24 hours? like will that make them grow faster or should i just stick to 18 - 6?.. and how many weeks should I be waiting to try to determine the sex of my plants

24/0 is fine the only reason people do 18/6 is it is believed that the plant will only use 18 hours of light and it saves on cost to have the lights off. As far as far as sexing you can do that any time you have multiple nodes on the plant. As soon as it's a foot or so I'd say sex that potential bitch.

I would give it 30 days minimum veg time.