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We get this question the most, and we sincerely wish we could give you a figure.
Divorces done through mutual consent typically do not go above Rs. 90,000 in legal fees, which includes fees for both parties. Contested divorces can cost significantly more, and the fee depends on the factual matrix of the case and how it proceeds.
This implies that if the lawyer has not agreed to a fixed fee for the matter, the legal expenses will be ongoing, and it is up to the client and counsel to decide the terms of the fee arrangement.
As for the factual matrix of the case, different lawyers will have different assessments of the complexity and technicality of the matter, so the fee is very likely to vary.
It would be prudent to have a word with more than one lawyer before making a decision. For your information, it is very rare to find an advocate willing to handle a contested divorce for less than Rs. 2 lakh.

Divorces of mutual consent usually get settled within eight months.
Cases where marriage is annulled may be decided even sooner.
Contested cases typically do not conclude before two to three years.