A good 'til canceled order is a time-in-force limitation that can be placed on a stock or ETF order and defaults to an order expiration date of 180 calendar days from the order entry date at 4:00 p.m. ET. You may select your own order expiration date and/or time, up to 180 calendar days from the order entry date. If all or part of your order is not executed by the date and/or time you've selected for expiration, any open portions of your order will be canceled.