Single-day validity
If you place an order with single-day validity, the order will expire at the end of trading hours on the relevant exchange day.
Multiple-day validity
If you set the validity period over more than one day, the order will remain open until it is filled or canceled, or until the validity period has expired, whichever is sooner.
Limit order
You may choose to execute the order when a pre-determined limit is reached. However, it is possible that the order may not be executed when the limit is reached. This is because limit orders are executed on a “first come, first served” principle at the exchange and there could be an insufficient volume of your selected instrument where it is listed.