It all depends on many factors. Currents, air pressure, kite, rider skill/weight, board characteristics, how well you are at trimming and working a kite to build apparent wind etc etc.
I would suggest if you have a safe shallow spot with decent amount of room to try and see what you can do. It would be good training for you on how to actually fly a kite. I actually recommend everyone do this. You can work on light wind relaunch and getting back to shore with out swimming.
I know with a skim board and my old 12m I was able to ride in 10kts at 180lbs and go upwind a little. Anything less than that and it was hard to keep the kite in air let alone get enough pull to get up on a plane.
Holy crap, there is waaay more that goes into it than i thought lol but i do have a shallow spot to practice in. I should be good with the kite, cause i fly it in light wind frequently.... seeing as i live on a lake in florida lol i just need to work on riding i guess? I never had a proper lightwind board so this is different. I tried my buddys glide once, and that was wonderful lol