diff --git a/src/knotification.h b/src/knotification.h
--- a/src/knotification.h
+++ b/src/knotification.h
@@ -507,6 +507,22 @@
     void setUrls(const QList<QUrl> &urls);
 
     /**
+     * @return The notification timeout in milliseconds.
+     * @since 5.32
+     */
+    int timeout() const;
+
+    /**
+     * Set the timeout of the notification. It is ignored if notification is
+     * persistent. Value must be greater than 0, otherwise the notification's
+     * server default timeout will be used.
+     *
+     * @param timeout The notification timeout in milliseconds.
+     * @since 5.32
+     */
+    void setTimeout(int timeout);
+
+    /**
      * @internal
      * the id given by the notification manager
      */
diff --git a/src/knotification.cpp b/src/knotification.cpp
--- a/src/knotification.cpp
+++ b/src/knotification.cpp
@@ -59,11 +59,12 @@
     NotificationFlags flags;
     QString componentName;
     QList<QUrl> urls;
+    int timeout;
 
     QTimer updateTimer;
     bool needUpdate;
 
-    Private() : id(-1), ref(0), widget(nullptr), needUpdate(false) {}
+    Private() : id(-1), ref(0), widget(nullptr), timeout(-1), needUpdate(false) {}
     /**
      * recursive function that raise the widget. @p w
      *
@@ -274,6 +275,16 @@
     d->urls = urls;
 }
 
+int KNotification::timeout() const
+{
+    return d->timeout;
+}
+
+void KNotification::setTimeout(int timeout)
+{
+    d->timeout = timeout;
+}
+
 void KNotification::activate(unsigned int action)
 {
     switch (action) {
diff --git a/src/notifybypopup.cpp b/src/notifybypopup.cpp
--- a/src/notifybypopup.cpp
+++ b/src/notifybypopup.cpp
@@ -251,7 +251,12 @@
 
     // Persistent     => 0  == infinite timeout
     // CloseOnTimeout => -1 == let the server decide
-    int timeout = notification->flags() & KNotification::Persistent ? 0 : -1;
+    int timeout = -1;
+    if (notification->flags() & KNotification::Persistent) {
+        timeout = 0;
+    } else if (notification->timeout() > 0) {
+        timeout = notification->timeout();
+    }
 
     // if Growl can display our popups, use that instead
     if (NotifyByPopupGrowl::canPopup()) {
@@ -731,7 +736,12 @@
 
     // Persistent     => 0  == infinite timeout
     // CloseOnTimeout => -1 == let the server decide
-    int timeout = notification->flags() & KNotification::Persistent ? 0 : -1;
+    int timeout = -1;
+    if (notification->flags() & KNotification::Persistent) {
+        timeout = 0;
+    } else if (notification->timeout() > 0) {
+        timeout = notification->timeout();
+    }
 
     args.append(timeout); // expire timout