There is currently no extra function in CentralPlanner to block several days. It is therefore best to use the “recurring booking” function.
Create a “dummy booking” at the earliest possible time and select Add as a recurring booking.
Set the appropriate time period and the recurrence rate to “daily”.
Increase the time to e.g. 600 minutes (10 hours) to cover your entire opening time
Click on Select all (tables)
Add a note if necessary (e.g. “Company vacations”)
Make a reservation and block your business for the desired period