It depends on if they're growing, dormant, trying to flower, or trying to absorb old leaves.
Right now I am not watering mine at all, and I won't be for probably another month or so because they're absorbing old leaves, and water would mess with that. When they're done and the old leaves are gone I'll water them a little, but I'll have to stop fairly soon because then it will be summer and they'll go dormant again, so I'll leave them alone during the hottest months, other than maybe a little misting if they start looking very dry and wrinkled. Then I start watering again in the fall so that they can flower, and stop again during winter so they can start a new pair of leaves, it it starts over again.
It's kind of complicated.
