According to the 80/20 rule in time management, an estimated 80 percent of results are achieved from 20 percent of focused time. approximately 80 percent of work is done in nonpeak periods and 20 percent during the biological prime time. 80 percent of the available time should be spent on time-specific activities and 20 percent of the time should be reserved for non-time-specific activities. about 80 percent of the available time should be expended on tasks that are urgent and 20 percent of the time should be spent on other important tasks