It is well known that the people of Makkah used to perform Tawaf after every 4 rakats as their pause (Tarweeha) and because the people of Madinah were unable to perform Tawaf, they prayed 4 rakats Nafil Salah individualy and not in jamaat, as their pause (Tarweeha), making a total of 36 rakats in Madinah, but this act was soon stopped.
www.muftisays.com/forums/76-the-true-salaf-as-saliheen/49...