Request timeout while taking snapshot of indices for backup

I am trying to take backup of around 2TB in Elasticsearch(version 7.0.1) and the request timeouts exactly after 1 hr of processing.

Please find the curl command for taking snapshot below:
curl -s -X PUT "<ELASTICSEARCHSERVICE>:<CLIENT_PORT>/_snapshot/es_backup/$index-$snapshot_date_format?wait_for_completion=true" -H 'Content-Type: application/json' -d' {"ignore_unavailable": true,"include_global_state": true}'

Please note that I have set parameter wait_for_completion=true in the request
Is there any time limit set for this wait_for_completion option?
Kindly let me know if there is any other parameter that needs to be set or updated in the curl request?

Thanks in advance

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