Fórum Group Data Within 5 Hours Maximum, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

// aljodav
// http://rextester.com/users/376

namespace Rextester
{
    using Test=Rextester.Program;
    class Cfg{                     // Configuration
        public string Mr{get;set;} // Master Name
        public string Cd{get;set;} // Child Name
        public int Hs{get;set;}    // Hours
    }
    class PoD{                       // Point Data ➡ must be in ascending order for the property It.
        public int Id{get;set;}      // Data Id
        public string Dn{get;set;}   // Data Description
        public DateTime It{get;set;} // Insert Date Time
        public string Mr{get;set;}   // Master Name
        public string Cd{get;set;}   // Child Name
        public int Ct{get;set;}      // Count
    }
    class Program
    {
        List<Cfg> GetCfgs(){
            return new List<Cfg>{
                /**/new Cfg{Mr="Master1",Cd="Child1",Hs=5},
                    new Cfg{Mr="Master1",Cd="Child2",Hs=5},
                    new Cfg{Mr="Master2",Cd="Child1",Hs=5},
            };
        }
        List<PoD> GetPoDs(){
            return new List<PoD>{
                /**/new PoD{Id=1,Dn="Dn of 1",It= new DateTime(2016,9,8,3,0,1),Mr="Master1",Cd="Child1"},
                    new PoD{Id=1,Dn="Dn-of-1",It= new DateTime(2016,9,8,3,0,1),Mr="Master1",Cd="Child2"},
                    
                    new PoD{Id=2,Dn="Dn of 2",It= new DateTime(2016,9,8,4,0,1),Mr="Master1",Cd="Child1"},
                    new PoD{Id=2,Dn="Dn-of-2",It= new DateTime(2016,9,8,4,0,1),Mr="Master2",Cd="Child1"},
                    
                    new PoD{Id=3,Dn="Dn of 3",It= new DateTime(2016,9,8,5,0,1),Mr="Master1",Cd="Child1"},
                    new PoD{Id=3,Dn="Dn-of-3",It= new DateTime(2016,9,8,5,0,1),Mr="Master1",Cd="Child3"},
                    
                    new PoD{Id=4,Dn="Dn of 4",It= new DateTime(2016,9,8,9,0,1),Mr="Master1",Cd="Child1"},
                    new PoD{Id=4,Dn="Dn-of-4",It= new DateTime(2016,9,8,9,0,1),Mr="Master3",Cd="Child1"},
            };
        }
        
        public static void Main(string[] args)
        {
            Test t= new Test();
            
            List<Cfg> cfgs= t.GetCfgs();
            
            List<PoD> pods= t.GetPoDs();
            pods.ForEach(p=>p.Ct=1);
            pods.Sort((x,y)=>x.It.CompareTo(y.It));
            
            cfgs.ForEach(c=>
            {
                    
                Console.WriteLine("\n{0}\n\t➡ {1}, {2}", new string('-',50),c.Mr,c.Cd);
                string mr= c.Mr,cd= c.Cd;int hs= c.Hs;
                
                List<PoD> podsSeld= new List<PoD>();
                
                PoD first= pods.Where(p=>mr==p.Mr&&cd==p.Cd).FirstOrDefault();
                if(first!=default(PoD)){
                    PoD last= pods.Where(p=>mr==p.Mr&&cd==p.Cd&&((p.It-first.It).Hours<=hs)).Last();
                    int ct= pods.Where(p=>mr==p.Mr&&cd==p.Cd&&((p.It-first.It).Hours<=hs)).Count();
                    last.Ct=ct;
                    podsSeld.Add(last);
                }
                
                podsSeld.AddRange( pods.Where(p=>mr==p.Mr&&cd==p.Cd&&((p.It-first.It).Hours>hs)) );
                    
                podsSeld.ForEach(p=>Console.WriteLine("{0}\t{1}\t{2}\t{3}\t{4}\t{5}",p.Id,p.Dn,p.It,p.Mr,p.Cd,p.Ct));
                
            });

Console.WriteLine("\n\nHello, world!");
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,13 sec, cpu time: 0,12 sec, average memory usage: 15 Mb, average nr of threads: 3