I need to get logs last 10 min in c#

I need to get log last 10 min . I am not able to find a solution

example :
var parameters = new ContainerLogsParameters
{
ShowStdout = true,
ShowStderr = true,
Timestamps = true,
Since = "1"
};

Stream logStream = await (client.Containers.GetContainerLogsAsync(container.ID, parameters, default)).ConfigureAwait(false);

in above example what should I pass since value