using System;

using System.Net.Http;

using System.Threading.Tasks;

​

public class Program

{

    static async Task<int> MakeRequest()

    {

        DateTime start = DateTime.Now;

        var client = new HttpClient{};

        var resp = await client.GetAsync("http://google.fr");

        DateTime end = DateTime.Now;

        TimeSpan ts = (end - start);

        Console.WriteLine($"Http call executed in : {ts.Milliseconds}ms");

        return ts.Milliseconds;

    }

​

    static async Task Main(string[] args)

    {

        DateTime start = DateTime.Now;

        var cumulated = 0;

        for (var i = 0; i < 10; i++)

        {

            var time = await MakeRequest();

            cumulated += time;

        }

​

        DateTime end = DateTime.Now;

        TimeSpan ts = (end - start);

        Console.WriteLine($"Cumulated: {cumulated}ms");

        Console.WriteLine($"Total run: {ts.Milliseconds}ms");

    }

}