How long does the blizzard black card last?

The titles of blizzard black cards range from days to months. Blizzard has no fixed rules on how and when to punish black card users. Blizzard will investigate and confirm that black card users have violated the rules, and will take certain punishment measures, including titles, silence and freezing accounts. The length of a title varies from a few days to several months, and it may even be a permanent title.