Can I get a refund if I stay in the hotel for less than an hour?

Legal analysis: no, you can't refund maliciously after staying in the hotel, which violates public order and good customs. You can book rooms by the hour.

Legal basis: Article 509 of General Principles of Civil Law of People's Republic of China (PRC), the parties shall fully perform their obligations as agreed. The parties shall abide by the principle of good faith and fulfill the obligations of notification, assistance and confidentiality according to the nature, purpose and trading habits of the contract. During the performance of the contract, the parties shall avoid wasting resources, polluting the environment and destroying the ecology.