What is the difference between cycle time and lead time?

Cycle time measures how long it takes to produce one unit at a specific station or process step. Lead time measures the total time from order placement to delivery, including all processing, waiting, and transport time across the entire value stream. Cycle time is a component of lead time.

How many cycles should I measure for an accurate average?

A minimum of 10-20 cycles is recommended for a reliable average. For processes with high variation, 30 or more cycles may be needed. Video-based measurement tools allow you to capture and analyze many cycles efficiently without disrupting production.

What causes cycle time variation?

Common causes include operator skill differences, material quality variation, tool wear, ergonomic issues, incomplete standardization, and interruptions. Identifying and reducing variation is a key goal of continuous improvement and standard work development.

How does video analysis improve cycle time measurement?

Video analysis eliminates observer interference, allows frame-accurate timing (to within 1/30th of a second), enables repeated review of the same cycle, and captures details that may be missed during live observation. Multiple analysts can verify the same data independently.

What is Cycle Time? | Definition, Measurement & Optimization

Cycle time is the total elapsed time from the start to the end of a process or operation needed to produce one unit. In manufacturing, it includes all manual work, machine processing, and any waiting or transition time within a single work cycle. Accurate cycle time measurement is the foundation of line balancing, capacity planning, and continuous improvement.

How to Create

To measure cycle time accurately: (1) Define the start and end points of the work cycle clearly. (2) Observe and record multiple consecutive cycles (at least 10-20 for statistical reliability). (3) Separate the cycle into individual work elements: manual work, machine time, walk time, and wait time. (4) Record the time for each element. (5) Calculate the average, minimum, and maximum cycle times. (6) Identify variation sources and non-value-added time. Video-based tools like Yamazo VAS enable frame-accurate cycle time measurement by tagging work elements directly on recorded video.

Example

An operator at an assembly station performs: pick up components (3s), place on fixture (4s), tighten 4 screws (16s), inspect (5s), place finished part on conveyor (2s). The total cycle time is 30 seconds. However, measuring 20 consecutive cycles reveals variation from 27 to 35 seconds. The average is 30.5 seconds, but the variation suggests inconsistency in the screw-tightening step that should be investigated.

What is Cycle Time? | Definition, Measurement & Optimization

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