Portals to Area close over time: One portal closes every 90 seconds.
Here's a clarification:
Standard PoE Portals: In the base Path of Exile game, portals themselves don't have a set timer that closes them based solely on time.
Portal Timeouts: As mentioned previously, portals do have timeouts, but these are triggered by inactivity, not a fixed timer. If you leave the map instance (return to your hideout or another area) for an extended period, the portal will eventually close. This timeout varies depending on where you opened the portal:
Valdo's Puzzle Box: The mechanic you might be thinking of could be related to the unique item "Valdo's Puzzle Box." This item creates a special map zone with its own mechanics. Within Valdo's Puzzle Box: