It all depends on strain, how close is your light set-up and what type of light, are you using LST, that can be used to lower your plants under 12" and have as much veg. growth as you want!!!
Like hotphyre said, there's no way to be exact with that. I normally see anywhere from 6 to 10 nodes at 12" using a 400w hps. Hope that helps my friend.
wow! too many factors can influence internodal distance; strain, light intensity, difference between day/night temps, augmenting CO2, FIMing and on and on - no "correct" answer
Thanks for the replys..I wasn't lookin for an exact answer..I was just thinkin and wanted to ask the question I have an LSD which is about 8in with 9 nodes just curious what other have?
