Oh, and your question... You're probably wondering how much time others spend time without their partner because you want to compare. Well, you can't really. Each relationship is different the ones that are in it will need to find the balance themselves.
If you're getting ideas for a discussion with her you can't really say "Well, Billy gets to go out with his friends why can't I?" That would just sound childish. Different people, different situation, different everything. Instead, let her know what your needs are and listen to hers. Come to an agreement somewhere in the middle. Let her know that you've listened and you understand and that you will compromise but she will also need to understand your needs. It goes both ways.