Is khulʿ like a revocable divorce, or is it an irrevocable divorce, and how long does the court take to process it?

Khul' is an irrevocable divorce, after which the husband cannot take his wife back unless there is a new marriage contract. Its procedures in court take time, which varies according to the nature of the court's work and its location. It is permissible for the wife to appoint a representative on her behalf if she fears harm by her presence.