As far as i read ...
Offline
Activating offline trade: .offline
To activate offline trade, you need Offline Trade Scroll - unlimited
Offline Trade Scroll DOESN'T use. It's unlimited.
Offline Trade Scroll can be purchased with ToDs or you can buy it through another players.
Active time - 96 hours.
Prohibited to trade near GateKeeper in all towns. Giran and Aden, have differentiated shopping areas.