using System;

public class Program

{

    const int simulatoins = 10000;

    const int expectedNumberOfSubs = 200;

    const int minTimeInMinutes = 1;

    const int maxTimeInMinutes = 10;

    const int chanceToDeductTime = 30;

    public static void Main()

    {

        long totalTimeAdjustment = 0;

        var random = new Random();

        for (int i = 1; i <= simulatoins; i++){

            var totalTimeAdjustmentPerRun = 0;

            for (int j = 1; j <= expectedNumberOfSubs; j++){

                var timeAdjustment = random.Next(minTimeInMinutes, maxTimeInMinutes + 1);

                var subtract = random.Next(1, 100) <= chanceToDeductTime;

​

                totalTimeAdjustmentPerRun = (subtract) 

                    ? totalTimeAdjustmentPerRun - timeAdjustment

                    : totalTimeAdjustmentPerRun + timeAdjustment;

            }

            totalTimeAdjustment += totalTimeAdjustmentPerRun;

        }

        var avarageTotalTimeAdjustmentInMins = totalTimeAdjustment / simulatoins;

        Console.Write("Avarage Total time adjustment in minutes: " + avarageTotalTimeAdjustmentInMins);

        Console.WriteLine(" Thus ~ " + (avarageTotalTimeAdjustmentInMins / 60) + " Hours.");

    }

}