I was told that it takes a "sustained wind" of the speed you've set in order for the awning to come in (I've heard anything from 10 to 20 seconds), so I don't trust mine and bring it in if I'm gonna be away for any period of time. Especially if you're in an area prone to thunderstorms (and where isn't?), since you're bound to get sudden high gusts in T-storms.
In other news, my automatic awning also has a "freeze warning" so it comes in when the temp drops below freezing. Strangely, it also sometimes comes in when the temp goes over 95 degrees or so.