Time is omnipresent in human action as a means that must be economized. Every action is related to time as follows:
... A is the period before the beginning of the action; A is the point in time at which the action begins; AB is the period during which the action occurs; B is the point at which the action ends; and B ... is the period after the end of the action.
AB is defined as the period of production—the period from the beginning of the action to the time when the consumers’ good is available. This period may be divided into various stages, each itself taking a period of time. The time expended during the period of production consists of the time during which labor energy is expended (or working time) and maturing time, i.e., time required without the necessity of concurrent expenditure of labor. An obvious example is the case of agriculture. There might be six months between the time the soil is tilled and the time the harvest is reaped. The total time during which labor must be expended may be three weeks, while the remaining time of over five months consists of the time during which the crop must mature and ripen by the processes of nature. Another example of a lengthy maturing time is the aging of wine to improve its quality.