using System;

using System.Diagnostics;

using System.Threading.Tasks;

using System.Collections.Generic;

using System.Collections;

​

public class Program

{

    public static async Task Main()

    {

            var batches = Enumerable.Range(0, 1000);

            int batchSize = batches.Count();

            for (int i = 0; i < batchSize; i++) {

                var currentBatchSize = batches[i].ToList();

                Stopwatch sw = new Stopwatch();

                sw.Start();

                var response = await _client.DeleteObjectsAsync(request);

                sw.Stop();

                const int deleteCallsPerSecond = 3500;  

                int delay = request.Objects.Count * 1000 / deleteCallsPerSecond;

                delay = (int) (delay - sw.ElapsedMilliseconds);

                if (i <= batchSize -1 && delay > 0) {

                    await Task.Delay(delay);

                }

            }

    }

}