The quick answer is 3 months.
We review your Rs account with Zebpay every quarter: 30th June, 30th September, 31st December and 31st March.
On the above dates, if you have a Rs balance but there is no activity in your account in the last quarter, we will automatically transfer the amounts from your Rs balance to your registered bank account. If you have used your Rs account to buy and sell bitcoins in the last quarter then we won't do this. We reserve the right to do this even if there has been any activity in some cases.
We will auto transfer Rs balances of all the users to your registered bank accounts in the last week of March every year in batches.