Orchids need to be watered when they need it, not on a schedule. "When they need it" will be determined by the growth of the plant, the potting medium and container you use, and your growing conditions.
Phalaenopsis prefer to have their potting medium stay constantly moist, but like for all orchids, it needs to stay "open" and airy at the same time.
The key to success is to experiment and find the right combination that is good for the plant without overworking you.
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