Yes, that would be the difference between a guest and a resident. But that's not what is in question. What is in question is how they determine if a person actually lives in the residence. Management cannot dictate what hours your visitors can be there. And if they tried, I doubt they would have many tenants. By the logic used by this particular property manager, if she herself stepped into my apartment she would instantly be defined as living there.
My point is that unless management is engaged in some criminal stalking, they can't determine if a person leaving or entering the apartment is living there or visiting the person living there. It is based on nothing. It can't be enforced and can't be proven beyond a reasonable doubt.