We're in the process of configuring this on a site, and I'm wanting to set it up so that a specific service can be booked on the same day, but not within an hour of booking. For example, if it's 11:30AM the earliest appointment I should be able to book for today is 12:30AM.  How can I do this, since the "Block Before" does not appear to prevent someone booking within the number of minutes specified - it just blocks off other appointments before the specified time?