Kill Process after certain time + C#

how do i kill a process after say 2 or three minutes look at the following code:

 class Program
{
    static void Main(string[] args)
    {

        try
        {
            //declare new process and name it p1
            Process p1 = Process.Start("iexplore", "http://www.google.com");
            //get starting time of process
            DateTime startingTime = p1.StartTime;
            Console.WriteLine(startingTime);
            //add a minute to startingTime
            DateTime endTime = startingTime.AddMinutes(1); 
            //I don't know how to kill process after certain time
            //code below don't work, How Do I kill this process after a minute or 2
            p1.Kill(startingTime.AddMinutes(2));                
            Console.ReadLine();


        }
        catch (Exception ex)
        {

            Console.WriteLine("Problem with Process:{0}", ex.Message);
        }



    }
}

so I want that IE window closed after 2 minutes