The maximum length of a configuration object name.
Many filesystems (including HFS, NTFS, and ext4) have a maximum file name length of 255 characters. To ensure that no configuration objects incompatible with this limitation are created, we enforce a maximum name length of 250 characters (leaving 5 characters for the file extension).
Configuration objects not stored on the filesystem should still be restricted in name length so name can be used as a cache key.
http://wikipedia.org/wiki/Comparison_of_file_systems
const MAX_NAME_LENGTH = 250;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!ConfigBase.php/constant/ConfigBase::MAX_NAME_LENGTH/8.1.x