public static void Main()
double[] values = { 0.006, 0.123456, 1, 6.5, 12, 24, 12345.678987654, 4854440};
Console.WriteLine("{0,21}{1,18}","FromHours", "TimeSpan");
Console.WriteLine("{0,21}{1,18}","--------", "--------");
foreach (double value in values)
TimeSpan interval = value.FromHours();
string timeInterval = interval.ToString();
int pIndex = timeInterval.IndexOf(':');
pIndex = timeInterval.IndexOf('.', pIndex);
if (pIndex < 0) timeInterval += " ";
Console.WriteLine("{0,21}{1,26}", value, timeInterval);