Q question is how many summons are issued until Ex-Parte divorce is granted.?
Answer: There is no maximum Limit. After 3 summons, court may take decision
As per Dissolution of Muslim Marriage Act, it is the Women ( Your wife here ) is giving Divorce, and You are not accepting it.
1) Court can pass order, ex-parte in favour of her
2) if you donot want that, then you have to appeal as soon as possible
3) you have to pay Mehr as per contract.
4) you cannot postpone any longer on this.
If you give more facts then I may help