Configuring a canary release plugin

Hello Kong Community,

I am trying to configure the Canary Release plugin on a service with the below configuration.
{ "steps": null, "upstream_port": <somePort>, "upstream_uri": "/test-uri", "upstream_fallback": false, "start": 1582109400,<some epoch date> "groups": null, "percentage": null, "duration": 60, "hash": "none", "upstream_host": "<some ip>" }

The problem i am facing is that, the plugin starts sending the traffic to the upstream service.on the mentioned start time. But the duration which is defined as 60 sec. It does not follow that. It keeps on sending the requests to upstream service.

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