Default client timeout option set excessively high

[codypperson]

The default client timeout is set to 6000, but guzzle request options is looking for a seconds value. We were getting some intermittent 504s today and tracked it down to requests that call Kickbox client verify. As it turns out the client is defaulting to waiting 100 MINUTES to time out the API call, which explains why I wasn't seeing any errors logged. I suggest that the documentation and default be updated to reflect that the value should be in seconds, not milliseconds.