{"id":6393,"date":"2023-07-05T11:13:34","date_gmt":"2023-07-05T11:13:34","guid":{"rendered":"https:\/\/visgl.com\/?p=6393"},"modified":"2023-09-22T11:31:17","modified_gmt":"2023-09-22T11:31:17","slug":"what-are-man-days-in-quality-inspections-and-how-to-calculate-it","status":"publish","type":"post","link":"https:\/\/visgl.com\/what-are-man-days-in-quality-inspections-and-how-to-calculate-it\/","title":{"rendered":"What are man days in quality inspections, and how to calculate it?"},"content":{"rendered":"

Quality inspections ensure that your products meet the standards and specifications that the brand and customers expect. An inspection can be performed at different stages of the production process, such as pre-production, during production, pre-shipment, or after delivery.\u00a0<\/span><\/p>\n

A key factor determining the cost and duration of a quality inspection is the man-day. So what are man days, and how to calculate it for your inspection requirements?<\/span><\/p>\n

What is a man-day?<\/strong><\/h2>\n

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In quality control, a man-day is a unit of measurement that represents the amount of work that one inspector can perform in one day. A man-day is typically calculated based on an 8-hour working day, excluding breaks and travel time.<\/span><\/p>\n

What are the factors that affect man-days?<\/span><\/strong><\/h2>\n

Many factors affect the number of man-days required for a quality inspection. Those factors are:<\/span><\/p>\n

Sampling size<\/span><\/h3>\n

This is the number of units or samples that must be inspected from a given lot or batch of products. The sampling size can be determined using statistical methods, such as the AQL (Acceptable Quality Level) standard, which defines the maximum number of defects acceptable for a given sample size and inspection level.<\/span><\/p>\n

Inspection criteria<\/span><\/h3>\n

This list of checkpoints or requirements must be verified during the inspection. The inspection criteria include functionality, appearance, dimensions, labeling, packaging, safety, and compliance. The buyer, the supplier, or a third-party standard can define the inspection criteria.<\/span><\/p>\n

Inspection complexity<\/span><\/h3>\n

The difficulty or detail level involved in the inspection also affects man-day calculation. The inspection complexity can depend on the nature of the product, the inspection method, the equipment or tools required, and the inspector’s skills and experience.<\/span><\/p>\n

Inspection location<\/span><\/h3>\n

Where the inspection takes place, such as the factory, warehouse, port, or customer’s site, also affects the man-day calculation because the location can affect the travel time, transportation costs, and accessibility of the inspector.<\/span><\/p>\n

How to calculate the number of man-days for an inspection?<\/strong><\/h2>\n

To calculate the number of man-days required for a quality inspection, you need to estimate the time needed for each of the above factors.<\/span><\/p>\n

For example, let’s say you want to inspect 500 units of a product with 10 checkpoints at a factory 2 hours away from your inspector’s office. You can use the following formula:<\/span><\/p>\n

Man-days = (Sampling size x Inspection time per unit + Travel time per day) \/ Working hours per day<\/strong><\/div>\n