Calculation based on a daily total of lost hours by employee. Any day in which an employee works at an efficiency lower than 100% there is Employee Opportunity.
Day 1: Aaron worked 8 productive hours for the day and was at 90% efficiency for the day. His Employee Opportunity would be 48 minutes.
Day 2: Aaron works for 8 hours at 103% efficiency. There is no opportunity. Note that no extra credit is given for being over 100% efficiency.
Total: Opportunity for these two day is 48 minutes.