Increase notification duration for library exportation event to 10 se…

…conds

src/main/java/org/jabref/gui/exporter/ExportCommand.java

@@ -145,7 +145,7 @@ private void export(Path file, FileChooser.ExtensionFilter selectedExtensionFilt
                                 }
                                 notificationPane.hide();
                             })),
-                            Duration.seconds(5));
+                            Duration.seconds(10));
                 })
                 .onFailure(this::handleError)
                 .executeWith(Globals.TASK_EXECUTOR);