Queue Time

Introduction: Queue Time in Processes

Queue Time, also known as waiting time, is the period a product, service, or task spends waiting before moving to the next step in a process. It is a common factor in both manufacturing and service environments and is often a hidden source of inefficiency.

Background

Queue Time occurs when there is a gap between process steps—such as finished parts waiting for inspection, customer requests waiting for attention, or goods awaiting transportation. In Lean management, Queue Time is considered a form of waste (Muda) because it adds no value to the customer while consuming time and resources.

Key Elements

• Manufacturing: Items waiting for inspection, assembly, or transport.
• Customer Service: Requests or complaints pending action by staff.
• Logistics: Goods waiting for loading, unloading, or onward shipment.

Applications/Examples

• A factory where components wait in front of a bottleneck machine.
• A call centre where customers wait in line before speaking to an agent.
• A warehouse where shipments remain idle due to insufficient transport capacity.

Relevance/Impact

Long Queue Times lead to extended lead times, wasted resources, and customer dissatisfaction. Minimising them is a core objective in Lean and Six Sigma, supporting smoother workflows and faster service delivery.

Strategies to Reduce Queue Time

1. Process Redesign – Streamline workflows to eliminate unnecessary waiting.
2. Capacity Management – Match resources to demand to reduce bottlenecks.
3. Technology and Automation – Apply tools that accelerate task handling and reduce idle periods.

Queue Time is a critical performance factor in process management. By actively reducing it, organisations can lower costs, improve efficiency, and deliver faster, more reliable outcomes. Effective queue management directly enhances customer satisfaction and creates a competitive advantage.

See also

• Lead Time
• Cycle Time
• Bottleneck Analysis
• Waste (Muda) in Lean