TimeClock Pearl calculates overtime based on 40 hours per week and doesn't include the option of user custom overtime rules, e.g. any hours over 8 per day. If you use the auto lunch deduct (30 or 60 minutes), employees would only have one time clock entry per day allowing you to quickly identify and manually note days in which an employee worked more than 8 hours. You could also use the "Round to the Nearest 15 minutes System Preference to help both employees and timekeepers monitor daily overtime.