With such a powerful tool to control the desert, how could Fang Jie not use it?
Especially the Quicksand Tunnels, which would be extremely difficult to destroy once they were completed. Moreover, Fang Jie believed that no one would go out of their way to destroy such things.
Thus, Fang Jie dedicated almost all his efforts to producing Skeleton Labor, then used them to construct the Quicksand Tunnels.
A massive number of tunnels spanning the desert were needed, about a dozen or so, which was a huge project. Had he not hunted a large amount of Desert Snake-man and Desert Lizardmen this time, Fang Jie wouldn't have had enough materials.
These materials were all used to produce Skeleton Labor.
The production speed of Skeleton Labor was very fast, but the number required was too large, and the scale too grand.
Therefore, Fang Jie needed a continuous stretch of time to complete these Quicksand Tunnels.