using System;
using System.Globalization;
using System.Linq;
 
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string durations = "4:12,2:43,3:51,4:29,3:24,3:14,4:46,3:25,4:52,3:27";
 
            var output = from d in durations.Split(',')
                        //a better way is to use ParseExact but this is in next .NET 
                        //select TimeSpan.ParseExact(d, "m\\:ss", CultureInfo.InvariantCulture).TotalSeconds;
                         select TimeSpan.Parse(String.Format("0:{0}", d)).TotalSeconds;
 
 
            Console.WriteLine(TimeSpan.FromSeconds(output.Sum()));
        }
    }
}
 

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