By default, your available times will be displayed in 15 minute increments. You can change this to any value you desire from your "Set Up" page -> choose on "Availability Rules" under "How many minutes between appointment slots"

You would also have the option to match the booking interval based on the service's duration you have set up on your account ***eg. if your service is set up to 30 minutes duration then the system would also reflect booking intervals to 30 minutes (this is only available : if you are using a flexible schedule), by clicking on the "use service duration" label:

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