Are there any books or illustrations to know on the number of days of asaucam that one needs to follow if a relative attains the divine feet of an Acarya?

There are books available pertaining to this subject. Navalpakkam Sri U. Ve Mahavidwan Aiyya Swamy had written a book on this titled ‘Praceena Acara Sangraham’. Asauca Shatakam an edited version by Sri U. Ve Mahavidwan Melpakkam Swami is also available.