We have a service ("Chakra Balancing") that is booked in 20 minute increments.
All other services are booked in 15-minute increments. (30 minutes, 45 minutes, etc.)
I tried to set this up using the admin interface, which is very rich, by setting the base increment to 5 — but that didn't work, perhaps because the programming doesn't account for such a small number.
What can I do to get this working the way we need?