Hello I’m making a website for a friend. She wants to allow customers to book appointments via the website. She is a hairdresser so the appointments times are a bit difficult. Eg a colour appointment would take 45 mins to apply, then 45 min to develop and then another 45 mins to wash and cut. So overall the appointment time would be 2 hours 15 mins but with a 45 slot in between where she is available for another service. How can I implement this ?