boxing and unboxing time calcumate

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            for (int i = 0; i < 10000; i++)
            {
                box();
            }
            sw.Stop();
            Console.WriteLine("Box = " + sw.Elapsed.ToString());
            Stopwatch sw1 = new Stopwatch();
            sw1.Start();
            for (int j = 0; j < 10000; j++)
            {
                unbox();
            }
            sw1.Stop();
            Console.WriteLine("Box = " + sw1.Elapsed.ToString());
            Console.ReadLine();
        }
        private static void box()
        {
            int i = 123;
            object j = i;
        }
        private static void unbox()
        {
            int i = 123;
            int j = i;
        }
    }
}