Time Spans

using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        int extraMinutes = 01530;
        TimeSpan baseLength = TimeSpan.FromMinutes(45);
        TimeSpan total = baseLength + TimeSpan.FromMinutes(extraMinutes);

        string minutes = total.TotalMinutes.ToString(CultureInfo.InvariantCulture);
        string hours = total.TotalHours.ToString("0.00", CultureInfo.InvariantCulture);

        Console.WriteLine($"minutes={minutes}");
        Console.WriteLine($"hours={hours}");
    }
}

using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        int extraMinutes = 01530;
        TimeSpan baseLength = TimeSpan.FromMinutes(45);
        TimeSpan total = baseLength + TimeSpan.FromMinutes(extraMinutes);

        string minutes = total.TotalMinutes.ToString(CultureInfo.InvariantCulture);
        string hours = total.TotalHours.ToString("0.00", CultureInfo.InvariantCulture);

        Console.WriteLine($"minutes={minutes}");
        Console.WriteLine($"hours={hours}");
    }
}

using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        int extraMinutes = 01530;
        TimeSpan baseLength = TimeSpan.FromMinutes(45);
        TimeSpan total = baseLength + TimeSpan.FromMinutes(extraMinutes);

        string minutes = total.TotalMinutes.ToString(CultureInfo.InvariantCulture);
        string hours = total.TotalHours.ToString("0.00", CultureInfo.InvariantCulture);

        Console.WriteLine($"minutes={minutes}");
        Console.WriteLine($"hours={hours}");
    }
}