I water them usually once a day, but I stand there for like 5-10 minutes per plant. I live in Miami and it's hot right now.
They used to get watered twice daily, but I got tired of my housekeeper messing up my plants so she no longer waters them in the mornings. I water when I get home.
I try to water 2 times per day during weekends though.
My huge vanda is completely bare root and my other semi-large vanda is also bare root. My denisoniana, neostylis lou sneary, ascocentrum are in clay pots with coconut husk chips and they are growing like crazy.
My newest vanda is in a vanda basket--but bareroot. I plan to change it out of the vanda basket as I don't like to keep plants in wooden mounts.
Good luck!!!