In theory, as long as there are sufficient resources and finances, Jing Yan can infinitely expand Hongmeng City. But in reality, when a city expands to a certain extent, various obstacles arise.
For example, if the city is too large, cultivators within the city would spend a lot of time traveling from one end to the other. In cities like Hongmeng City, Jing Yan certainly cannot allow ordinary cultivators to fly freely. In almost all cities of the Heavenly Domain, free flying by cultivators is not allowed.
Of course, there are other factors that are not very important among the obstacles hindering city expansion.
The real unsolvable problem is the city's defense issue.
