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There are three expiry options when placing a trade:
Where your order will only remain active for the day you place the order, the order will then be purged by the market at the end of the trading session.
Where your order will remain on the market unless cancelled by you or is purged by the market.
Where you specify a date that you want the order to expire on, the order will remain on the market until this date unless cancelled by you or is purged by the market.