Five Days!
Almost all the Green Dwarfs in the small world were killed, leaving behind only some tribe or clan leaders. Those ones were kept alive on Lu Li's orders because he wanted to get some information. Otherwise, they would have been killed as well.
There were seven or eight thousand people searching, turning the small world upside down. They didn't find Bai Qiuxue but they did find hundreds of strange places in caves or tunnels.
Noble Lord Realm warriors each led their own teams to go look for the strange places and they would rule some out. After three days, they located three areas.
One of them was an underground cave, a very deep one. Zi Huanyu went down there in person and he didn't reach the bottom after he traveled for hundreds of miles. He was afraid to do deeper and came back to report.