Since we don't see "walk up" traffic, we don't post "open hours". Besides, it's fun to keep getting nagged by Yelp! because they want us to post some hours of operation. :)
Booking is by appointment only. If you visit the booking/scheduling section of the site, it will allow you to choose from the available time slots. If you can't book it, it's not open. If you can, it is.
The exception is, of course, you can mail us at anytime with questions, comments, or maybe just to talk.