Multiply TimeSpan in .NET

From this article

TimeSpan duration = TimeSpan.FromMinutes(1);
duration = TimeSpan.FromTicks(duration.Ticks * 12);
Console.WriteLine(duration);     

For those wishing to copy and paste:

namespace Utility
{
    public static class TimeSpanExtension
    {
        /// <summary>
        /// Multiplies a timespan by an integer value
        /// </summary>
        public static TimeSpan Multiply(this TimeSpan multiplicand, int multiplier)
        {
            return TimeSpan.FromTicks(multiplicand.Ticks * multiplier);
        }

        /// <summary>
        /// Multiplies a timespan by a double value
        /// </summary>
        public static TimeSpan Multiply(this TimeSpan multiplicand, double multiplier)
        {
            return TimeSpan.FromTicks((long)(multiplicand.Ticks * multiplier));
        }
    }
}

Example Usage:

using Utility;

private static void Example()
{
    TimeSpan t = TimeSpan.FromSeconds(30).Multiply(5);
}

t will end up as 150 seconds.

TimeSpan.Multiply has arrived in .NET Core, and looks like it will arrive in .NET Standard 2.1:

https://docs.microsoft.com/en-us/dotnet/api/system.timespan.op_multiply?view=netstandard-2.1

   var result = 3.0 * TimeSpan.FromSeconds(3);

The TimeSpan structure does not provide an overload for the * operator, so you have to do this yourself:

var result = TimeSpan.FromTicks(duration.Ticks * 5);