They work from 9 till 5, and then the towercontroller comes out to give them the evening off.
But seriously... I don't really get your question? How does the wind blow up the thing?
Or do you mean the fact that they are mostly calibrated at 15kts to stand fully blown still in the wind. If the wind blows harder, they start moving like a flag (dunno the english word for that, in Dutch we would say: wapperen), and if the wind blows less hard than 15 kts, they are bent down a bit.