Coelogynes don't like to dry out. So feel it - as it goes from "wet" to "damp" you can gauge how often to water. If in sphagnum, you don't want it to get to "crispy". Frankly, I'd rather see you water more frequently and let the water run through the pot, rather than soaking. The running water pulls air into the root zone, flushes "crud". That's more like a "monsoon" than soaking is. (I water most things daily in summer, but they are outside, get a nice breeze, and dry out fast. Your environment is likely to be quite different. So feel the medium, lift the plant to learn how the weight changes, and aim for a cycle of "wet" to "damp" and repeat)
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