How long do rare/boss monsters, e.g. midnight panther, stay spawned?

Question

When a boss monster spawns, how long do they stay at their spawn location before disappearing if they're NOT killed or tamed.

Like say they Midnight panther spawn at server save 10:00, will it stay until next server save or do they have a time limit of e.g. 5 hours before they go away? 

Answer 1

For what I know, regular bosses stay 4 hours after they appear. Bosses that you can tame, like Midnight Panther, Undead Cavebear and Crustacea Gigantica, stay until server save.

Comments

Okay, if thats true. Its really good for the ones that are looking for mount rares :)