Maximum key / value length in application configuration files

What is the maximum permissible length for MyKeyand MyValuein the configuration file?

<configuration>
  <appSettings>
    <add key="MyKey" value="MyValue" />
  </appSettings>
</configuration>
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By knowledge, there are no restrictions on a pair of key values ​​in the webconfig file .....

If you plan to add an object to the configuration file, verify that this message will help you complete your task.

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