Setting for notification duration (stay on screen)

I'd like to resurface this request if it's at all possible as it would be extremely helpful for us using this service on an Android TV (more specifically, an Nvidia Shield)...

https://support.pushover.net/i81-setting-for-notification-duration-stay-on-screen

The default notification length is only 3 seconds which is far too short... I'd love it to stay on for 8 or 10 seconds.  The app "Notifications for Android TV" claims they have a feature to control the length of time that a notification is displayed... Are they not using standard Android notifications?