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.
regards
You can specify working times on the calendars.
See: https://bryntum.com/products/gantt/docs/api/Gantt/model/ProjectModel#field-hoursPerDay
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.