When I leave a map (like Ancient Pyramid, Fetid Pool, Tidal Island…) through a town portal, entrance, or teleporter and immediately return to it, the map stays explored.
But, if I don't return for about half an hour in singleplayer (without a party), I have to start over with exploring the map.
How long can I stay outside a map without losing my exploration progress?
Best Answer
You can stay between 8 and 15 minutes outside an instance before it reset:
Poe wiki :
In addition, you can open the Instance Manager menu with 'CTRL + Left Click' on an entrance (or portal) that will show you exactly the time left after the reset of the instance.
It looks like this (patch 2.2.0):
It is mainly use to reset manually an instance for farming a specific area.