From Liang Province to the end of the Land of Buried Bones, Yu Shangrong, with his Seven-leaf speed, Ji Liang's speed, and several stops in between, took about ten days to reach his destination. If he did not have Ji Liang, he would have needed twice the amount of time. After fighting the Clarity Sect's Master, Zhang Yuanshan, he returned to Brackish Mountain's Melilot Graveyard with his Eight-leaf speed. That took him seven days with several stops along the way.
If one traveled at the full speed of an Eight-leaf cultivator without resting, they would need about five days to travel from Lou Lan, past Heaven's Moat, to Liang Province. With the full speed of a Nine-leaf cultivator, without resting, it would take a couple of days.
After a day had passed, the seven allied nations had more than enough time to massacre the people of Liang Province, Yi Province, and even Yu Province!