Simple GraphQL query to get total build duration from Buildkite API

build-duration.js

var graphql = require('graphql.js');
var moment = require('moment');
moment().format(); 

var graph = graphql("https://graphql.buildkite.com/v1", {
  method: "POST",
  headers: { "Authorization": "Bearer <api-token>"},
  asJSON: true,
  debug: true,
});

var jobs = graph.query(`
  query {
    build(slug: "{organisation}/{pipeline}/{buildnumber}") {
      jobs(first: 500) {
        edges {
          node {
            ... on JobTypeCommand {
              startedAt
              finishedAt
            }
          }
        }
      }
    }
  }
`);

jobs().then((response) => {
  const times = response.build.jobs.edges.map(edge => {
    var start = moment(edge.node.startedAt);
    var end = moment(edge.node.finishedAt);
    return moment.duration(end.diff(start));
  });
  const sum = times.reduce((prev, cur) => prev + cur, 0);
  const hms = moment.utc(sum).format("HH:mm:ss");
  console.log('HMS: ' + hms);
}).catch((error) => {
  console.log(error)
});

% npm start

> [email protected] start
> node build-duration.js

[graphql]: POST https://graphql.buildkite.com/v1: query ... with {}...
  QUERY: query 
    query {
      build(slug: "buildkite/pipeline/build") {
        jobs(first: 500) {
          edges {
            node {
              ... on JobTypeCommand {
                startedAt
                finishedAt
              }
            }
          }
        }
      }
    }
   
  VARIABLES: {}
 
HMS: 02:27:23

Corresponding build in BK UI