It's not okay to burden someone staying in their home.
Zen is staying at a friend's house because he lost his apartment and Zen has questions but his friend is working in his home office.
Zen wants to decide if he should knock and ask the questions or not.
Zen waits for his friend to finish work before asking questions.
Zen knocks and is told to hold on, then mentions it'll take just a minute.
The relationship stays respectful and secure.
Zen realizes he's wearing out his welcome when his friend gets annoyed with him.