For a Srivaishanava what are the recommended prayers / mantras during a normal day?

Answer: Listing only the bare minimum routine performance. Daily Sandhya Vandanam, Gayatri Japam, equally Ashtaakshari Japam, Bhagavat Thiruvarathanam – Ijjya, recitations of Sookthams and Sahasranamam. These are the brief & very minimum one that one can follow; in normal terms, for persons belong to working class, this much would take good time. All the time chanting the glory of Sriman NarayaNa is the most vital one to continue. If you have enough time to spend, you may chant Upanishads, Sundara Gaandam From Ramayana etc.