Reservations start from full hours.

I have this same issue. We have teachers that want to block hour-long conferences during their various open office times - which only works when their availability starts at the top of the hour, since increasing granularity of available times means appointments can be booked to start at any of those times, as opposed to the times that correspond to the service hour segments.

It would be nice if Bookings would look at the service length (plus before/after buffers) and generate the available choices based on that information. So if we're setting up a one hour service and hours on Wednesday ran from 3:00p to 6:00p, Bookings would show availability at 3:00p, 4:00p, & 5:00p. If Thursday hours were 2:30p to 5:30p, then Booking would show 2:30p, 3:30p, & 4:30p.