using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public static class TimeSpanExtensions
{
    public static String ToStringUnlimitedHours(this TimeSpan span)
    {
        return $"{((int)span.TotalHours).ToString("D2")}:{span.Minutes.ToString("D2")}:{span.Seconds.ToString("D2")}";
    }
}