The answer to that is 21 days exactly, although you need to bear in mind that this can vary, depending on a number of circumstances. Generally speaking however, fertile chicken eggs which are hatched out by a hen will take 21 days before you see little faces staring at you from underneath their mamma's wings.
In linguistics, a register is a variety of a language used for a particular purpose or in a particular social setting.
Register In everyday English, people usually say put time/energy etc into something rather than devote time/energy etc to something: He put a lot of time into the project. 2 to use a particular area, period of time, or amount of space for a specific purpose devote something to something The meeting will be devoted to health and safety issues. â See Verb table