The Business Hours setting in improveit 360 dictates the hours in which Sales and Project Appointments can be scheduled. By Default, every improveit 360 system allows for scheduling 24 Hours a day. You will want to adjust this setting, based on your company's operating hours.
Navigate to Setup
In the Quick Find > search 'Business Hours' and select the Business Hours link under Company Profile:
Click Edit on the Default Business Hours to enter which hours your organization is available to work. Be sure to uncheck the '24 hours' checkbox to enter your company's operating Hours.
Select to 'Use these business hours as the default'