C# - TimeUtils.ToHumanReadableTimespan

public static string ToHumanReadableTimespan(long miliseconds)
    {
        const int SEC = 1000;
        const int MIN = 60*SEC;
        const int H = MIN*60;

        var timeSpan = TimeSpan.FromMilliseconds(miliseconds);

        if (miliseconds < 1000) return string.Format("{0} ms", timeSpan.Milliseconds);

        if (miliseconds/SEC < 60) return string.Format("{0} sec", timeSpan.Seconds);

        if (miliseconds/MIN < 60) return string.Format("{0}:{1:00} min", timeSpan.Minutes, timeSpan.Seconds);

        if (miliseconds/H < 24) return string.Format("{0}:{1:00}:{2:00} hours", timeSpan.Hours, timeSpan.Minutes, timeSpan.Seconds);

        return string.Format("{0}:{1:00}:{2:00}:{3:00} days", timeSpan.Days, timeSpan.Hours, timeSpan.Minutes, timeSpan.Seconds);
    }