This time can then be split into smaller blocks of time, each for a fixed duration which can then be reserved by other people, perfect for booking one-to-one appointments with your students.
With Google Calendar Appointment slots, it is possible to set up a block of time to advertise when you are available. See: How do I create an Appointment schedule in Google Calendar? Google has introduced a new feature called Appointment schedules which will eventually replace Appointment slots.
This article describes how to use Google’s Appointment slots.