Metin2 Dragon Stones stop providing their effects when their duration reaches zero, but they do not disappear. You can recharge them with a Time Elixir.
When does the timer run?
Each Dragon Stone has a maximum usage duration of 24 hours. Its remaining time decreases only while its Dragon Stone set is active.
Players can equip up to two Dragon Stone sets, but only one set can be active at a time.
How recharging works
Use Tongs of Time on an unused, unequipped donor Dragon Stone to extract a Time Elixir. The donor stone is consumed, and the extraction can fail.
After a successful extraction, apply the Time Elixir to the Dragon Stone you want to recharge. The target stone can remain equipped.
Time Elixir (S) values can be 5%, 15%, 30%, 50%, or 100%. The percentage represents a fixed portion of a Dragon Stone's default duration. For example, a 50% elixir restores 12 hours.
A crafted Time Elixir (S) lasts for 24 hours. An elixir cannot increase a Dragon Stone's remaining time beyond its maximum duration.