TimeSpanExtensions.cs

using System;
using System.Text;

public static class TimeSpanExtensions
{
    /// <summary>
    /// Returns a string containing the human readable version of this time span, i.e 4 days, 3 hours, 26 minutes and 13.4 seconds.
    /// </summary>
    /// <param name="timeSpan"></param>
    /// <returns></returns>
    public static string ToHumanText(this TimeSpan timeSpan)
    {
        var sb = new StringBuilder(30);

        if (timeSpan.Days > 0)
        {
            sb.Append(timeSpan.Days);
            sb.Append(timeSpan.Days == 1 ? " day" : " days");
        }

        if (timeSpan.Hours > 0)
        {
            if (sb.Length > 1)
            {
                sb.Append(", ");
            }

            if (timeSpan.Minutes == 0 && timeSpan.Days > 0)
            {
                sb.Append("and ");
            }

            sb.Append(timeSpan.Hours);
            sb.Append(timeSpan.Hours == 1 ? " hour" : " hours");
        }

        if (timeSpan.Minutes > 0)
        {
            if (sb.Length > 0)
            {
                sb.Append(", ");
            }

            if (timeSpan.Seconds == 0 && timeSpan.Hours > 0)
            {
                sb.Append("and ");
            }

            sb.Append(timeSpan.Minutes);
            sb.Append(timeSpan.Minutes == 1 ? " minute" : " minutes");
        }

        if (timeSpan.Seconds > 0)
        {
            if (sb.Length > 0)
            {
                sb.Append(", ");
            }

            if (timeSpan.Minutes > 0)
            {
                sb.Append("and ");
            }

            sb.Append(timeSpan.Seconds);
            if (timeSpan.Milliseconds > 0)
            {
                sb.Append(".");
                sb.Append(timeSpan.Milliseconds);
            }

            if (timeSpan.Seconds == 1 && timeSpan.Milliseconds == 0)
            {
                sb.Append(" second");
            }
            else
            {
                sb.Append(" seconds");
            }
        }

        if (timeSpan.Milliseconds > 0 && timeSpan.Seconds == 0)
        {
            sb.Append(timeSpan.Milliseconds);
            sb.Append(timeSpan.Milliseconds == 1 ? " millisecond" : " milliseconds");

            sb.Append(" (");
            sb.Append(timeSpan.Ticks);
            sb.Append(" ticks)");
        }

        return sb.ToString();
    }
}