How do I convert ticks to minutes?

I have a ticks value of 28000000000 which should be 480 minutes but how can I be sure? How do I convert a ticks value to minutes?

TimeSpan.FromTicks(28000000000).TotalMinutes;

A single tick represents one hundred nanoseconds or one ten-millionth of a second. FROM MSDN.

So 28 000 000 000 * 1/10 000 000 = 2 800 sec. 2 800 sec /60 = 46.6666min

Or you can do it programmaticly with TimeSpan:

    static void Main()
    {
        TimeSpan ts = TimeSpan.FromTicks(28000000000);
        double minutesFromTs = ts.TotalMinutes;
        Console.WriteLine(minutesFromTs);
        Console.Read();
    }

Both give me 46 min and not 480 min...

You can do this way :

TimeSpan duration = new TimeSpan(tickCount)
double minutes = duration.TotalMinutes;