These don't have a real dormant dry rest according to OrchidWiz. Just a slightly drier few months in late winter/early spring. You should be able to water them when they are dry and then let them go completely dry before watering again. That is usually how I water all my Cattleyas. You can use the skewer method if you are not sure when they are dry. When a dry rest is mentioned, it still usually means they get some water, just less than when it is hot and sunny.
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