I think that if you are willing to adopt a senior border collie, it could work out, but even then you still run the risk of it being too active. Border collies are working dogs -- they are not suitable as only family dogs, and you run the risk of having a dog that becomes frustrated and acts out in problematic ways.

7 hours a day without someone is too long for any puppy --- so I assume you are going with an older dog? What kind of things do you like in a dog?