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.
a national register of historic places. a register [=(US) registry] of voters. (Brit) After the students were seated, the teacher called/took the register. [=read a list of the students' names out loud and noted which students were there and which were not] [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 2.