Segmentation data, 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;

namespace Rextester
{
    public struct TimeValue
    {
        public DateTimeOffset Time;
        public double? Value;

public TimeValue(DateTimeOffset time, double? value)
        {
            Time = time;
            Value = value;
        }
    }
    
    public class Program
    {
        public static void Main(string[] args)
        {
             List<TimeValue> ttcaList = new List<TimeValue>();

Random s = new Random();
            DateTimeOffset dto = DateTimeOffset.Now;

for (int i = 0; i < 6; i++)
            {
                ttcaList.Add(new TimeValue(dto.AddMinutes(i*5), s.Next(0, 20)));
            }
            for (int i = 0; i < 5; i++)
            {
                ttcaList.Add(new TimeValue(dto.AddMinutes(10*5).AddMinutes(i*5), s.Next(0, 20)));
            }

foreach (var item in ttcaList)
            {
                Console.WriteLine(item.Time+"   value "+ item.Value);
            }

var grouped = ttcaList.GroupBy(tv => new DateTimeOffset(tv.Time.Year, tv.Time.Month, tv.Time.Day, tv.Time.Hour, (tv.Time.Minute / 5) *5, 0, tv.Time.Offset))
                .Select(g =>
                  g.OrderBy(tv => tv.Time).ToList()
                ).ToList();

Console.WriteLine("\n\n grouped data");

foreach (var skup in grouped)
            {
                Console.WriteLine("\t\t group");
            foreach (var item in skup)
            {
                
                Console.WriteLine(item.Time+"   value "+ item.Value);
             }
            }

Console.ReadKey();
        }
    }
}

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Compilation time: 0,14 sec, absolute running time: 0,13 sec, cpu time: 0,11 sec, average memory usage: 16 Mb, average nr of threads: 3