Most of the time it is several momentary flickers. Less frequently the power is off a few hours. A week ago, a wicked windstorm knocked out power for about 22 hours at my place. Downed trees, blown down and snapped poles, blown up transformers. 15 minutes of probably 80mph straight wind did all this.
It took about 12 hours for the line crews to chainsaw clear 1.2 miles of county paved road and make.repairs along the way. On the gravel roads where my cabin is situated, neighbors with chainsaws and small tractors cleared our private roads.
Always fun discovering what the storm left for you on the roads to the cabin. :)