Bookings - force time intervals to be 30- or 15-min only

This is related to this post which was left unanswered.

https://answers.microsoft.com/en-us/msoffice/forum/all/bookings-force-services-available-times-to-start/be7d0942-e0cf-4293-a1fe-4ac51a4a8d31

I created a service that has a 35-minute duration. So if i start at 10am, the available time slots should show as 10:00, 10:45, 11:30, 12:15, 1:00, etc. what i mean is that when a client will book at 10, even if the appointment is only for 35 minutes, the next client can only book at 10:45, and so on and so forth. this is to ensure that there will be no weird start times.

I have already done the suggestion from copilot below but still not working:

1. Set Appointment Duration: Go to the "Services" section in Bookings and set the appointment duration to 35 minutes.
2. Add Buffer Time: In the same "Services" section, add a buffer time of 10 minutes after each appointment. This ensures that the next available slot starts at a clean

3. Adjust Time Increments: Navigate to the "Booking Page" settings and set the time increments to 15 minutes. This will make the available time slots align with your desired intervals.

Is this something that is not doable from a user perspective and really needs to have a system code change to allow for this feature? I highlighted the start times in the screenshot below that are somewhat weird when scheduling an appointment.