Hindu units of time
Vedic and Puranic texts describe units of Kala measurements, from Paramaṇu (about 17 microseconds) to Maha-Manvantara (311.04 trillion years). According to these texts, the creation and destruction of the universe is a cyclic process, which repeats itself forever. Each cycle starts with the birth and expansion (lifetime) of the universe equaling 311.04 trillion years, followed by its complete annihilation (which also prevails for the same duration). The current Universe is, according to Hindu scripture, in the 51st year of Brahma, which suggests that it was created about 155.5 trillion years ago. This figure does not match the modern estimated age of the universe of ≈ 13.79 billion years. It is unclear, however, if the Hindu concept of the universe is the same as "Western" modern concept of the universe.
Time units
Various units of time are used across the Vedas, Puranas, Mahabharata, Suryasidhanta etc. Especially, Nimesha's multiple, it varies to 3, 10, 15, 18, 20, 27, 30, 45, 48, 60. At the lower end, these are pretty consistent. The Complete Hindu metrics of time (Kāla Vyavahāra) can be summarised as below.
