Cymbaline - fertilising schedule may depend on what media you're using, and how the media and the orchid is watered.
In my case - for my region, my choice of growing media is scoria. I apply weak liquid fertiliser by spraying into the media - once a month. And 2 weeks afterward, I apply cal-mag (weak).
I don't know exactly what occurs in the media - but my guess is that when I apply the fertiliser, the fertiliser gets into the media - eg. the scoria, and stays there for a while. So there-after, when I water at some later stage, the roots may still have access to fertiliser (nutrients) in the media.
It may certainly be better to apply fertiliser on a weekly basis instead --- weak application each week.
But I have never gone for the weekly schedule. All my orchids stay in great shape.
A nice workable schedule will likely depend on what method of growing is being used. Also, it depends on some aim or plans of growers too maybe - such as - do the orchids need to have their growth processes optimised for commercial reasons, or for plant competitions? etc.
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