I have taught you what time is and what is the meaning of the relation of existence to it and the relation of estimation. There are many days, and some of them are large and small, the smallest of which is individual time, and accordingly every day comes out in a matter, so individual time is called a day because the matter occurs in it, so it is the smallest and most precise of times, and there is no limit to the largest of them that stops at it, and between them are intermediate days. The first of them is the known day according to custom, and it is separated by hours, and hours are separated by stairs, and stairs are separated by minutes, and so on until it is infinite according to some people, as they separate minutes into seconds, and when the rule of number entered into it, its rule was number, and the number is not finite, so the detail in that does not end, and some people say about finiteness in that and look at it from this perspective. The countable are those who prove