Postman: https://demo.mytimein.com/rainfall/tracking/UploadApplications

postman.tests.js

//1000 ms is a maximum allowed value according to requirements
maximumResponseTime = 1000;
//100 is a number of sent requests according to requirements
iterations = 800;
//100 ms is a delay between requests according to requirements
//responseTimes is an array for collecting response time values
responseTimes = [];
i = 0;

while (i < iterations) {
  i++;
  sendRequest()
}

function sendRequest() {
  pm.sendRequest({
    url: "https://demo.mytimein.com/rainfall/tracking/UploadApplications",
    method: 'POST',
    body: {
      mode: 'raw',
      raw: JSON.stringify({
        "job_id": 259,
        "applications": [
          {
            "window_title": "Facebook",
            "application_name": "Brave Browser",
            "url": "https://getemoji.com",
            "seconds": 500
          }
        ]
      })
    },
    header: 'token: <TOKEN>',
  }, function (err, res) {
    pm.test("Response time is " + res.responseTime, function () {
      pm.expect(err).to.equal(null);
      pm.expect(res).to.have.property('code', 200);
      responseTimes.push(res.responseTime);
    });
  });
}