Юрий

int minutes = 1;
while (true)
{
   if (Console.KeyAvailable)
   {
        ConsoleKeyInfo c = Console.ReadKey(true);
    if (c.Key == ConsoleKey.Enter)
    {
            break;
    }
   }
   Thread.Sleep(1000);
   if (minutes++ > 10)
   {
    throw;
   }
}