How long into flowering will you start to see bud?

I was just wondering about how long into flowering will you start to see buds ? Im running 4ft. fluorescent tubes.

2 weeks few hairs. 3 week small bud sites

After veggin for 8 weeks from seed, I was able to determine the sex in 1 week from the start of the 12/12 light cycle. I used a magnifying glass and looked for ball sacs. The males seem to show their sex earlier than the females. I'm using a 600w HPS tho.........