 Judaism provides its own definitions for this period; at the same time, various rabbinic authorities differ on just how those definitions are to be applied for different purposes.The Talmud often states calculations of these "zmanim" in terms of the time it takes to walk some distance, stated in "mils".Most authorities reckon the time it takes to walk one "mil" as being 18 minutes, though there are opinions of up to 24 minutes.