How to interpret k6’s test results?

The official documentation does explain a bit on the different types of metrics reported by k6 and how to interpret them.

But having read them both, I still am not able to put two and two together. So let me be very specific, is the following correct?

The http_req_duration metric is the sum of:

• http_req_blocked: Time in the DNS lookup, connection, and TLS handshake phases.
• http_req_sending: Time to send the request.
• http_req_waiting: Time waiting for the server to process the request.
• http_req_receiving: Time to receive the response.

For example, if you have:

• http_req_blocked: 20ms
• http_req_sending: 10ms
• http_req_waiting: 250ms
• http_req_receiving: 20ms

The total http_req_duration would be 300ms.

If so, why it’s not matching my following k6 test result, if not, then what’s the correct way to interpret k6’s test results?