What are the Sunnahs of leaving Majlis?

What are the Sunnahs of leaving Majlis?   

 Read to clear up mistakes after assembly 

    سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ, أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا أَنْتَ أَسْتَغْفِرُكَ وَأَتُوبُ إِلَيْكَ    

Meaning: 'O Allah!  You are far removed from all imperfections (You are pure) and I praise You.  I bear witness that there is no god worthy of worship but You.  I seek Your forgiveness and return to You.  

A Muslim gathers in many majlis day and night, viz.    

When you talk to others while eating,  You must talk when you see your neighbor or friend, when you are with your fellow classmates at work, school, study, when you talk to children and spouses together, when you are traveling, during public lectures or personal studies etc.  

  Notice how many times you can mention this dua day and night and keep your relationship with Allah.

The benefit of implementing this Sunnah is that the mistakes and sins committed in speaking in that meeting will be expunged.    Ibn al-Qayyim said that there are two types of assembly in which Muslims gather    

Social gatherings are held to pass the time.

The benefits are limited and it pollutes the heart and wastes time.  The majlis which are held for giving the advice of truth.  It is of immense value and most beneficial.