I think it all depends on the dog. My Boxer hates being left alone for more than an hour or so and gets separation anxiety. He will destroy the house if left to his own devices. He has managed to chew and rip our blinds down, chew a window sill, tear his bed to shreds, eat one of the cushions on the couch, and chew other misc. stuff. (He does not get into anything at all if we are home) He gets plenty of exercise but just can't be left alone for very long.
Our pug on the other hand will find random stuff to get into but doesn't do much damage at all.
If the dog is laid back and you can make it home for lunch it may not be a bad idea.