Phrase "देशकालवस्तुपरिच्छेदशून्यम्" is used in many Advaita vedanta lectures. In which scripture it has its origin?

The concept of time in Hindu mythology has remarked that one day of god is equal to billions years of human. for example( correct me if wrong) One day of Brahma = 4.32 billion human years One year of Brahma = 4.32 billion * 360 (days and nights in a Brahma year) human years The lifespan of Brahma...