Wife sent divorce notice. Living separately since 1.5 years.she has no

Hello all, I married 3 years ago.ow My wife have filed for divorce with false allegations without any police complaint.i also want to give divorce to her as she tortured us mentally. We are living separately since 1.5 years. She is not attending the court procedure. Now we have given reply objection statement to that divorce petion with false allegations. She is a working women with good salary. We dont have kids. Now we i have opted for mediation in court. But as per our information, she want divorce anyhow so she may not come for mediation also...for court trial after mediation, I dont think that she has evidence,as I did nothing to her... Can anyone tell me that how much more time will take place for this divorce procedure to end?? How much alimony I have to give as she is well educated & earning women with high salary.