What is hours per unit, blue collar to white collar ratio and useful hours per unit in manufacturing?

• Hours per Unit: The amount of labor time required to produce one unit of product in manufacturing.
• Blue Collar to White Collar Ratio: The ratio of manual labor employees (blue-collar) to managerial or administrative employees (white-collar) within a manufacturing organization.
• Useful Hours per Unit: The actual productive labor hours spent on manufacturing one unit of product, excluding downtime, breaks, and non-productive activities.