Right now there is no way to exclude weekend days from the date range field in calendar settings. If you can only take calls Mon-Fri, and only want people to be able to book on your calendar up to 5 week days in the future, there's no way to ensure that 5 week days are available at all times. For example, if I set the date range to 5 days, someone booking an appointment on Friday night will only see 3 days of availability, because the calendar counts the weekend days even though they're never an available option. We should be able to more accurately set the date range to exclude days that we will never be available to take appointments.