using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(ToHumanTimeString(TimeSpan.Parse("02:30:00")));

    }

    /// <summary>

    /// Converts <see cref="TimeSpan"/> objects to a simple human-readable string.  Examples: 3.1 seconds, 2 minutes, 4.23 hours, etc.

    /// </summary>

    /// <param name="span">The timespan.</param>

    /// <param name="significantDigits">Significant digits to use for output.</param>

    /// <returns></returns>

    public static string ToHumanTimeString(TimeSpan span, int significantDigits = 3)

    {

        var format = "G" + significantDigits;

        return span.TotalMilliseconds < 1000 ? span.TotalMilliseconds.ToString(format)  + " milliseconds"

            : (span.TotalSeconds < 60 ? span.TotalSeconds.ToString(format)             + " seconds"

                : (span.TotalMinutes < 60 ? span.TotalMinutes.ToString(format)           + " minutes"

                    : (span.TotalHours < 24 ? span.TotalHours.ToString(format)           + " hours"

                                            : span.TotalDays.ToString(format)           + " days")));

    }

}