I have mostly Paphs (500+) and I do not want the mix to dry out in less than 5-6 days. I tend to leave larger plants in the same pot 18-30 months, smaller plants 12-24 months. I have used all the common bark brands, combined with some charcoal & Perlite, and have no complaints.
That Orchiata tends to be drier is a negative for Paphs. That it lasts up to 10 years makes no sense when the plant outgrows the pot in 18-24 months.