The higher the level of the NPC, the longer it takes for them to reappear after they die. If it's a special role, such as a sect leader or an elder, the respawn time will be even longer.
As for dying under a powerful Daoist technique or special treasure, there will be an additional penalty of delayed respawn time, which is calculated separately.
However, no matter what, there won't be a rare-level NPC with a level as high as 155 that can respawn in just two minutes. If that were the case, the world would be in chaos, and NPCs would become monsters that can never be killed.
In fact, when an ordinary Daoist disciple like Qingcheng dies, he will have to reappear after two to twelve hours, depending on his level. Of course, his name and spells will change after reappearing.
As for an NPC like Fire Traveler, Ye Rong originally estimated that it would take two days for him to respawn.