A countdown timer written in C# 7.1+ using an async main method and an async task delay

csharp_7point1orlater_asyncmain_countdowntimer.cs

using System;
using System.Threading.Tasks;

namespace CountdownTimer
{
    class Program
    {
        public static async Task Main( string[] args )
        {            
            int delay = 500; // Default delay
            bool parsedSuccessfully = false;
            
            try
            {
                if ( args.Length > 0 )
                {
                    parsedSuccessfully = Int32.TryParse( args[0], out delay ); //This overwrites `delay` with 0 if it fails to parse.
                }

                if ( !parsedSuccessfully || delay < 1 ){ delay = 500; }
                else if ( delay > 60000 )
                {
                    Console.WriteLine( "[Long-Wait WARNING]: delay.exe was scheduled to run for {0} seconds.", (float)delay / 1000 );
                    Console.WriteLine( "Select this console and press 'CTRL' + 'C' on your keyboard to quit earlier." );
                    Console.WriteLine( "Alternatively, you can \"End task\" this delay.exe using the Task Manager's \"Details\" tab." );
                }
                else if ( delay > 2000 ){ Console.WriteLine( "delay.exe will be running for {0} seconds.", (float)delay / 1000 ); }

                var delayInterval = TimeSpan.FromMilliseconds( delay );

                await DoActionAfter( delayInterval, () => Console.WriteLine( "Delay of {0} milliseconds completed.", delay ) );
            }
            catch( Exception e ){ Console.WriteLine( "Internal error from delay.exe: {0}", e.Message ); }
        }

        public static Task DoActionAfter( TimeSpan delay, Action action ) => Task.Delay( delay ).ContinueWith( _ => action() );
    }
}