I have a case where the teacher wants to schedule the students himself.

I had set up the scheduler and removed the permission for 'book slots' from students. However... if you do this, students can not be booked anymore. A teacher can still not book for the student with this solution.

Now I have created it as a stealth item. That should work too.

But, is there another option? Maybe increase guard time to 52 weeks or something?