Can anyone direct me to a reference on how to optimally exit a basket of stocks? For example, suppose I have 100 long stocks to exit in the next 1-2 hours. My thinking is to submit limit orders 0.5% above the current ask, cancel unfilled orders after 15 minutes, wait 15 minutes, resubmit orders on remaining positions a little closer to the current ask, and so on, increasing the aggressiveness of the order as the end of the exit window nears. There must be some standard approaches that are known to be effective.