Basic trades are executed at 4pm, you can cancel the order any time until 3:45pm.
You can’t cancel an instant trade, because it’s, of course, instant - but you can review it before you hit buy. 
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Basic trades are executed at 4pm, you can cancel the order any time until 3:45pm.
You can’t cancel an instant trade, because it’s, of course, instant - but you can review it before you hit buy.