Reports have been under processing for over an hour now. What's the expected timeout ?

Here's the response I've been getting
{
"metadata": {
"requestId": "0ee3210c-4bda-4be8-8c34-8c5f3ab0a9e3",
"clientId": "83",
"responseTime": 344,
"requestedURI": "GET /payments/transactions/reports/256860"
},
"payload": {
"message": "The report request is under processing, please try after some time"
}
}

And this is the request I made.

https://apigateway.snapdeal.com/seller-api/payments/transactions/reports/256860?reportType=SETTLED

Though I have had success with some reports in the past, right now, none of the reports are processing. What should be the timeout when our system gives up and re issues a new report API call.