If the phal is potted, it can easily go at least a week without water. A two week vacation in a cool room is fine for them too. My sister was taking care of a phal I left behind in the fall while I was away at school. She didn't water it for 3 weeks. The leaves were all wrinkled and limp, but I gave it a good soak and now, 3 days later, it has perky, almost wrinkle free leaves.
If your phal is in a clear pot, just monitor the root color to know when to water. Silvery/white roots mean it's time to water. Green roots, as well as beads of moisture in the pot mean the plant has enough moisture for the time being. I know that your conditions are probably different than mine, but for info, my go 8 days or so at this time of year before the roots become completely silver again.
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Camille
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