One hour after the other went bye, and soon enough, it was three in the morning.
Inside the massive illusion in the middle of the square, the students were starting to get nervous. By rotating, they had tried to stop the charmed ones into the illusion for as much as they could, but their immortal essence was starting to run thin.
The consumption of essence was way higher than the amount which the resting ones recovered, and soon enough, they would find themselves not only having to face these sixty cultivators, but do so while having close to no power left.
If that was not bad enough, the difficulty of their feat was high enough for them to be unable to keep an eye on what was happening outside, and instead have to focus on their illusion, or recover as much of their power, in as little time as possible.