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# Report & Chart Time Compression

As time progresses, **data is compressed** in order to greatly increase reporting efficiency and performance. Because of data being compressed into different time blocks, if you request data with a time span that overlaps a compression change, the data may be displayed in the chart differently than what you expected.  
  
For instance, if you create a chart to display statistics on an hourly basis spanning more than a month (which would overlap the change in compression from hourly to daily compression) you may notice that a small section is not hourly data, but daily data. This effect is due to the compression where the hourly data for a day has been compressed into a daily average.  
  
**Related Links**  
*   [Time Compression](https://abkb.crisp.help/en-us/article/time-compression-vvi5vk/)
*   [Reasons for Time Compression](https://abkb.crisp.help/en-us/article/reasons-for-time-compression-15fx6ev/)