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cantSUPenough said...
how much wind is usually enough to generate the waves?
"Downbreezing" (i.e. very light wind downwinding) typically starts with winds around 10-12 knots. You won't get many true glides then but with the right skills it can be done. By the time you get to 15 knots you are starting to catch glides more regularly, and you can actually have quite a reasonable session with winds of 15-20 knots if the conditions are well lined-up. Downwinding proper really starts around 20 knots, and by the time you get to 25 you can be gliding more than paddling. 30 knots is where you can occasionally (on a DW board) get blown into bumps without paddling for them, and by the time you get to 40 knots you are using the paddle more to steer and brace than catch bumps. 50 knots is a whole load of fun but can be pretty alarming unless you are experienced and the wind is pointed in EXACTLY the direction you want to go. It is extremely difficult to paddle across 50 knots of wind and paddling upwind is impossible, so you are going pretty much where the wind is blowing you whether you like it or not. Most of the videos you will see of people downwinding the wind will be in the 20-35 knots range.
If you are starting out, I'd stick to conditions in the 15-20 knot range until you've sorted out the basics of things like safe loading and unloading of your boards, getting them to the beach, safe entry and exit points, and being able to know where you should be heading if poor visibility occurs (eg. fog, mist, a heavy thunderstorm or poor light) just in case you eg. fall and dislocate a shoulder or something like that.
And ALWAYS wear a leash!