The question implies a dog left alone is going to have a destructive or unpleasant experience. Dogs do not need us to entertain them, they can amuse themselves all day (and through the night). The appropriate answer would be that as long as your Lab has been provided with toys and stimulation, they will be content when on their own. They’re called “laboratory” dogs for a reason!
And I’m willing to bet that you will find your Lab more content and well-behaved after some time spent playing and learning on her own than she was before you left her at home…in front of the television! Give it a try, go spend some time away from home, and notice how good it makes your dog…