Limit number of notifications by time and/or count on android 6

[AC Question]

notification sounds will continue at intervals until you open it and close. i can be on a phone call, receive a text message, which I hear during my conversations, which causes me to miss what they or myself are speaking, and it will continually do this until i open notification. Beyond annoying. Some apps I dont want silence their ntfy, but I only want one initial acknowledgement?