Hi, Leon.

Yes. You can achieve this by changing the Default Time Slot Step.

Find it in main Amelia settings/General settings/Default Time Slot Step.

This setting allows you to choose a default length for the time slot step, which is used to “grid” the business hours and appointment durations. It determines the time slot step in which your appointments can be scheduled. 

The setting contains time slot step options ranging from 1 minute to 8 hours, and what you define here will be applied to all time settings such are “Duration”, “Buffer time before” and “Buffer time after” in the Service settings.

For example, if you choose 10 minutes as the default time slot step, the working hours will be divided by a grid of 10 minutes, your customers will be offered to book appointments at 9:00, 9:10, 9:20, 9:30, etc., and the service duration will be configurable as 10 min, 20 min, 30 min, 40 min and so on.

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And one more important option here :

Use service duration for booking a time slot

Enable this option if you need to set the time slots on the booking form to be the same as the service duration.

 For example: let’s say you provide service between 5:30 pm and 9:30 pm and the service lasts 1 hour. If you use this Default Time Slot Step 30 minutes, your clients will see available time slots at 5:30, 6:00, 6:30, etc.

 If however, someone books 6 pm the preceding half-hour cannot be used (a customer cannot book because the service lasts 1 hour).

 If you enable the service duration option, however, customers will see 5:30, 6:30, 7:30, and 8:30 as the available times and there will not be a time shown that cannot be booked.

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Please check more details explained about this here :

https://wpamelia.com/general-settings/

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Additionally, I just wanted to point out that we have pages with Demos, that you can use to try out the plugin's features - https://wpamelia.com/demos/

and there is a 15-day money-back guarantee period, so if you purchase the plugin, you can safely fully test it out,

we would assist you with our support along the way, and if it doesn't fit your needs you can request and receive a refund in that period.

Let us know if that helps.