18:20。 According to the map of Gaode, from Huangpi to Paulownia, you can take bus P 18 to bus P 1 1, or take bus P 13 to bus P11. The latest departure mode is to take bus P 13 and transfer to bus P11. The last bus of bus P 13 leaves at 18:20, but pay attention to transfer again to avoid missing P 1 165438.