Rest Mode is a state of inactivity in which a character is not fighting or running around. Crafting is only possible during Rest Mode, and it could take a few seconds, a few minutes, and more than 10 minutes depending on what kind of items you are crafting. In Rest Mode, HP restores faster. There are also various activities that players can undertake during Rest Mode such as crafting consumables… You can set up a fire place when you are in Rest Mode. It enables faster HP restoration and if there are other players nearby, then those players will also receive benefits from it.
The default key to toggle Rest Mode on and off is the Insert key.