Setting up a retargeting lookback window means deciding how far back you want to track people who visited your site or clicked your ad. If the window is too short, you might miss people who need more time to decide. If it’s too long, you could end up wasting money on users who already lost interest. A good starting point is 7 to 14 days. This gives people a bit of time to think without letting them forget completely. For some offers like health or finance, where decisions take longer, you can try up to 30 days. It’s also smart to test different lengths and see which one gives the best results. What other methods do you think help keep retargeting more effective?