Watching how long users stay before a pop-up appears helps identify the best timing. Measuring clicks, sign-ups, and close rates shows whether the message feels helpful or annoying. Comparing different delay lengths reveals which moments encourage engagement without hurting the browsing experience. Bounce rates and return visits also indicate whether the ads build interest or drive people away. These insights make it easier to adjust timing, improve offers, and display pop-ups when users are more likely to respond positively.