The Booking Charge Slot setting lets you define the minimum chargeable duration for a booking. If you'd like to charge for a full hour's duration for any booking that takes below an hour, you can do that using this setting.
What You'll Need
Choose a Booking Charge Slot
You can find the setting in Settings/Platform/Bookings & Calendar tab. There are three options that you can choose from - 15 minutes, 30 minutes, and 1 hour.
Depending on the minimum chargeable slot chosen, a booking will always be charged for at least the minimum duration chosen. This setting is respected for both booking fees and booking credits/coins usage.
If you select the minimum booking charge slot to be 1 hour, even if the members book for less time, they will still be charged the 1-hour price: