What is the significance and historical context of 'Parayans' and 'Saptahs' as mentioned in the Satcharita's preface?

The preface, found in Chapter 0, explains that 'Parayans' (hundreds of readings) and 'Saptahs' (weekly recitations) are a powerful form of Guru service, especially when performed with the biography of one's Sadguru. The text emphasizes that this is not a modern practice but a very ancient one, with roots dating back to the Vedic era. To establish this historical context, the author notes that Parayans and Saptahs of major Sanskrit works like the Vedas, Bhagavata, and Ramayana, as well as Marathi texts like the Dnyaneshwari, are common and long-standing traditions. This positions the practice as a time-honored and revered method for spiritual devotion and study.