I have that question, when im using that config, it changes general calendar option too, i want to use that only for Business , how to do that.
You can specify working times on the calendars.
hoursPerDay are used for calculating durations. You can set it to 24 and specify the working time on the calendar.
Here you find it in more detail: https://bryntum.com/products/gantt/docs/guide/Gantt/basics/calendars
Up in this topic you can read how to change the calendar config.