How long does a conversation window stays open without initiating new message templates in WhatsApp, Facebook & Instagram?

How long does a conversation window stays open without initiating new message templates in WhatsApp, Facebook & Instagram?

 Conversation Persistence Durations

  1. WhatsApp - 24 hrs period
  2. Facebook - 7 days period 
  3. Instagram - 7 days period
  4. Facebook Ads (click to WhatsApp link) - 72 hrs
  5. Instagram Ads (click to WhatsApp link) - 72 hrs