Divorce case

To summarize the overall case: Me and my wife separated 2 years back and we have a 3 years old. I try to put lot of effort for reunion though friends and family member but nothing has changed. So I filed a case for reunion in the court and in effect of this, she filed an interim maintenance only for child and currently she is working in IT firm. Am ready to pay maintenance for child and it’s my duty to take care of kid. But I have an intuition that she will not agree to live with me even after counselling. In that case what will happen?. For how long this case will go. Meanwhile, her lawyer connected and kept a demand of 20 lakhs as a onetime settlement. But I do not have money and my parents are depend on my income and my father is cancer patient and my mom is heart patient and I don’t have any Asset to accommodate her request. And how much money I need to pay for maintenance for example my salary 40K .Is there any possibility to go for onetime settlement though court based on my financial status?