The UILongPressGestureRecognizer lets you listen for a long press on a view. You can set the length of delay before the action method is called.
Swift
override func viewDidLoad() {
    super.viewDidLoad()
    // Long Press
    let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(_:)))
    longPressView.addGestureRecognizer(longPressGesture)
}
// Long press action
func handleLongPress(gesture: UILongPressGestureRecognizer) {
    if gesture.state == UIGestureRecognizerState.Began {
        label.text = "Long press recognized"
    }
}
A fuller sample project can be found here.
Change the minimumPressDuration to set the length of long press.
 
                