In the code posted, when you click on the annotation, the speech balloon pops up to say 

```
Hello World!
Welcome to my marker

```

I would like to know how to make the speech bubble appear while using the app, and have the speech bubble display some text that the user would enter in, and disappear after about an hour or so. The bubble would be able to be seen by other users even if the user logged out or closed the app, and the bubble would still be open when the user goes back into the app, unless the window of time for the bubble has passed.

Thank-you

```
import Mapbox

class ViewController: UIViewController, MGLMapViewDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()

        let mapView = MGLMapView(frame: view.bounds)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        // Set the map’s center coordinate and zoom level.
        mapView.setCenter(CLLocationCoordinate2D(latitude: 40.7326808, longitude: -73.9843407), zoomLevel: 12, animated: false)
        view.addSubview(mapView)

        // Set the delegate property of our map view to `self` after instantiating it.
        mapView.delegate = self

        // Declare the marker `hello` and set its coordinates, title, and subtitle.
        let hello = MGLPointAnnotation()
        hello.coordinate = CLLocationCoordinate2D(latitude: 40.7326808, longitude: -73.9843407)
        hello.title = "Hello world!"
        hello.subtitle = "Welcome to my marker"

        // Add marker `hello` to the map.
        mapView.addAnnotation(hello)
    }

    // Use the default marker. See also: our view annotation or custom marker examples.
    func mapView(_ mapView: MGLMapView, viewFor annotation: MGLAnnotation) -> MGLAnnotationView? {
        return nil
    }

    // Allow callout view to appear when an annotation is tapped.
    func mapView(_ mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool {
        return true
    }
}

```