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If your phal is large and healthy to begin with, 18 days without watering should not be a problem. If it's in sphag, it might not need to be watered any more frequently than that anyway, if the temp is 68 degrees. Water it well before you leave, soaking the medium, and keep it out of direct sun and out of the direct path of air blowing from the air conditioner. It's probably better for it to get a bit dehydrated than for some well-meaning person to come in and pour massive amounts of water on it every day while you're gone.
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