I have had 2 labs so far. They are very hyper, active dogs. I don't believe in leaving my dog outside all day, personally. I let mine out when she wants and she can come in when she wants. I don't like to leave her unsupervised for long times, and certainly not if I'm not home.

When Clover was younger I took her for an off leash run at least once a day for 45-60 mins plus walks on leash. She is a very well behaved dog and is not that hyper anymore. They just need proper exercise (especially the first couple years). Even if you did leave the dog outside they still require this amount of exercise or it's not really fair to the animal. They will likely become destructive to where ever they are kept otherwise. They are wonderful dogs if trained and get enough exercise