# Why is there an abnormal spike in Cycle Time?

Occasionally, you may observe a spike in **cycle time** due to specific events or practices. Here are some common causes:

1. **Merging of a Complex Task**: A challenging or intricate task that took longer than usual to complete may have been merged, extending the cycle time.<br>

   <figure><img src="/files/gfuAilbTSQm6fFapbxW8" alt="" width="288"><figcaption></figcaption></figure>
2. **Cleanup of Long-Standing PRs**: Older pull requests (PRs) merged as part of cleanup activities can inflate cycle time temporarily.<br>

   <figure><img src="/files/2aAojc2IIMMCdSn8gP2b" alt="" width="287"><figcaption></figcaption></figure>
3. **CI/CD Merges for Production**: Certain CI/CD practices involve bundling all sprint commits into a single production merge, leading to a large PR with timestamps from the entire sprint, increasing the cycle time.<br>

   <figure><img src="/files/WxKkIuXvLSbKksIaE8nB" alt="" width="288"><figcaption></figcaption></figure>

In these situations, it’s best to [<mark style="color:purple;">**exclude such large or unique PRs**</mark>](https://hivel.gitbook.io/knowlegebase/using-hivel/pull-request/how-to-exclude-outlier-commits-and-prs) from your cycle time calculations. Doing so provides a clearer, more representative view of day-to-day cycle times, making the data more actionable and relevant.


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