How does the reset floor work?

Question

Basically how does it works? It happens only at the server saves or during the day? Sometimes my letter disappears from the cave and I don't see anybody there

Answer 1

Some caves have floor reset from time to time and not only at server save, like nightmare island.

But the floor reset will only happen if no one is in the screen.

But some other places it just happens at Server save, like Catacombs / Library

Answer 2

​​​​​

According to Tibia Fandom, these areas are known as upgrade zones. Basically it doesn't always happen on Server Save, some people are wrong about this issue because it can happen at different times.

| de reset do piso TibiaWiki | Fandom

• Floor reset happens in different places at different times.
• The time a floor reset happens will be always the same for a given place (example: If you notice a floor reset in a tomb at 9pm you can be sure that each day if no players are around, there will be a floor reset at 9pm in that tomb).
• Floor reset happens 4 times per day with periods of 6 hours between each floor reset.
• A floor reset will occur in a method similar to creature respawns. When no players are near an area that's going to have a floor reset the place will be reset, but if someone was or is near that area it will be no floor reset.
• Locations that receive more player-traffic will not have many floor resets. For example, floor rarely resets in towns where there are almost always people walking around.
• Some places never reset (only on game updates or when the Game World is launched). Such examples are houses and certain towns.
• After a Server Save there will be always a floor reset (unless is a place that only resets after an update).
• After a floor reset Daily Respawns of items will occur.
• The Feyrist peninsula has an unusual frequent rate of one floor reset every 30 minutes because of its changes during the day/night cycle.