  It was found in the paper that the time frames of the studied system
operation depend on the research objective. In cases when it comes to problems,
related to the physical movement of the input and output products, limits of
the study are defined by the time of the beginning of the movement of the first
input product of the operation and ends with the time of issue of the last
output product of the operation by the system. Time of completion of the
physical movement of products is defined in the paper as the time of the
physical completion of the operation. Since the purpose of any operation is to
increase the value of the output products in relation to the value of input
products of the operation, in cases when there is a problem of investigating
the target operation, the time of completion of the target operation is
determined not by the physics of the process, but its cybernetics. Since for
the time of the operation, conversion processes link input products in time,
the added value of output products is intended to compensate in time the costs
of temporary binding of input products that initially have their value. The
time, when the added value of output products of the target operation
compensates the value of tight input products for the time of the operation, is
defined in the paper as the time of the actual completion of the target
operation. A system of notations to describe the system processes of target
operations was proposed. The expressions for the numerical and analytical
determination of the time of actual completion of the target operation were
obtained. A link to the resource, with examples of calculations of the time of
the actual completion of the operation with the use of numerical methods and
analytic expressions, obtained in the paper was given.
