The decision to have several titled Immortal Emperors make their move in five days to break the formation, escape the Ten-Thousand-Cable Prison, and ultimately flee the Tianshi Palace compound was entirely because Emperor Qingyuan and Emperor Xiaotian would happen to be at the exact location Duan Lingtian had tricked them into going by that time.
By then, even if the two of them received a message and wanted to rush back immediately—even taking the nearest heavenly plane transmission array instead of traveling the whole way themselves—it would still take them five or six days to return at top speed.
Because of this, making a move at that time was the absolute best option.
Chapter 3322