TOTAL MESSAGES: 1
UNIQUE MESSAGES: 1
DUPLICATES: 0
<script>
(function () {

    // Start time
    var startTime = Date.now();
    var sent = false;

    function sendDuration() {
        if (sent) return;
        sent = true;

        var durationSec = Math.round((Date.now() - startTime) / 1000);

        // Αγνόησε πολύ μικρούς χρόνους (noise)
        if (durationSec < 3) return;

        var ref  = document.referrer || "";
        var page = window.location.href || "";

        var url = "/track.php"
            + "?ref=" + encodeURIComponent(ref)
            + "&page=" + encodeURIComponent(page)
            + "&duration=" + durationSec;

        if (navigator.sendBeacon) {
            navigator.sendBeacon(url, new Blob([], { type: "text/plain" }));
        } else {
            fetch(url, { method: "GET", keepalive: true });
        }
    }

    // Όταν φεύγει από τη σελίδα
    window.addEventListener("pagehide", sendDuration);
    document.addEventListener("visibilitychange", function () {
        if (document.visibilityState === "hidden") {
            sendDuration();
        }
    });

})();
</script>