It would be useful if the post explained what YC Office Hours are. Is this a way to get into YC? A chance to have feedback on my startup? Or just an opportunity to meet a YC person?
Office hours are 25 minute meetings where you can ask for feedback on a particular challenge your company is facing, or you can use the time to ask questions about YC. They're fairly casual conversations, rather than formal pitch sessions.
edit: the question was answered by katm