No guarantees, its like snowboarding theres a chance when you get to the mountain it wont snow same with kiting theres a higher than avergage chance that it will be windy on most days of your trip, I've been there and kited on a 8m for 18 days straight but thats not the norm.
The trades blow in a cycle of about 5 days on, 2-3 days off. The wind will build over those five days from 12-15, peak around 22 and then drop back off. Then there will be a couple of days where its 12 and less and then cycle repeats its self.
But the are variables where the highs and lows just don't sit in the right places and if your lucky the winds blow for many more days or if you are unlucky its 4 or five days with out wind.
Ive had nearly 60 days in total over there and i would have
easily kited 45 of those on 8m to 16M kites