Thanks to Ashrosfin's reminder, Roland's team didn't enter Bianca City but circumvented it via another road.
The first prince spent most of his time in the city, especially at this critical moment, in order to win more allies and make fewer enemies.
Although the first prince had made a bold statement, and the soldiers of Bianca City had been searching for the queen, it was impossible for them to inspect everybody who passed Bianca City. Besides, Roland never really entered it, so the soldiers had no idea that the queen dropped by.
Then, Roland passed another two cities and communicated with the chairmen of the Magic Towers. He was quite lucky that both of them were open to communication.
Roland talked to each of them for a couple of days and learned a lot.
The magic apprentices learned a lot too.
Due to this communication and overall traveling time, it took the team almost a month to reach Reed Village.