We are not working for Steemit anymore. We just post reports here and some comments.
Your blacklist on HIVE will stay for 28 days as long as you have not finished Step 2 of appeal which is:

Publish at least one original post per every day of your appeal. Your appeal consists of minimum 28 days. There must be minimum 28 days containing at least 1 original post. You can take break on some days but altogether there must be 28 different days that contain at least one original post.
You dont have to write essays but please make the posts interesting and original. Even personal diary is original as long as it is not one sentence.