how long take to get child custody without divorce.

What a average period taken place in court to get child custody of 11yrs daughter and 8yrs boy from mother to father. Both didn't applied for divorce, father in Tamilnadu and mother in Kerala. Children's studied in Tamilnadu till Apr 2018, now mother gone to her parent home with children's and no willing to come to husband's place and not sending children's too, schools are going to open from june 4 onwards. Any chance of getting child custody order quickly because children's studies are in problem. We are Muslim's. Husband is hanafi.