I live in a totally different environment than you do so my watering frequency is far different. And yes, if you are sure the media isn't breaking down or the orchid is not over-potted, 2 weeks between watering is fine. I have my dens in winter rest and some have had water only once in the last 6 weeks. They look fine and look to be actually adding roots.
I would say trust your instincts about when one needs water/is dry enough to water.
I am not a 'soaker' when it comes to watering and in my house during the winter it is far drier than it is in summer. I find I actually have to water more frequently for those orchids that don't want reduced watering/fert during the winter. I have found so far, in my relatively short growing experience, that if the orchid is still putting on new growth/s in the winter, then i don't reduce the watering.