Postman: https://demo.mytimein.com

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 = 850;
//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",
    method: 'GET',
  }, 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);
    });
  });
}