Time period of divorce procedure.

I am getting divorced and has children to take care of. It is not a mutual consent divorce. I cannot trust him with the custody of children. I left his home with children leaving all my things except some clothes because he was threatening us. Problems started after his return from abroad. After that he tried to stop me from working. After sometime he gave me money for a coaching class for an exam. I passed the exam but he never showed any enthusiasm. And he stopped me from pursuing higher studies. Instead he compelled me to have another child and I got pregnant. He enrolled for higher studies. After the delivery he started shouting about the expenses as if I am the cause of all problems. I left home for good and he never called me for 1 year. Then some problems brought us to meet again and I tried to reconcile and we started living together only for some months. When he began to threaten all of us we left home. He had mental problems. So I filed case on the basis of that. How long will I have to wait for divorce? I don't want a mutual consent divorce. Because I want the custody of children. And if I couldn't prove his illness what will be the consequences?