your puppy is really cute! i think it's very nice of you to worry about whether or not you are spending enough time with him.
well, you are working a lot of hours. plus school, and you didn't include the hours that you need to put in for homework and study, so once that's included, how many hours is that?
you can look into dog daycare places if you can afford it. make sure you do your research to find a good doggie daycare. i know that most dogs are very happy to go to doggie daycare because they can play there and they make friends with other doggies. it's really cute.
also, maybe you can find a pet sitter, or if your friends can help you watch your dog while you are away.
OR, you can get another dog, so at least they can keep each other company while you are gone.
i wouldn't want to give my dog away either, but i think that they do deserve to have a good quality life (and their lives are way to short and precious to be wasted being alone and bored) so if i were you, i would look into doggie daycare, or pet-sitting services because i would not want to give my dog away. but if you can't do that for whatever reason, then you really should look for a loving home for your baby. obviously you will need to take time to find someone you can trust that will provide the love and attention your dog deserves. there are a lot of dog lovers out there that have the time and means to spoil your baby if you cannot keep him.
i really hope you can keep your baby. but i say do what's best for the little dog even if it means you cannot keep him.
good luck to you!!!
