Orchids tend to be pretty hardy, so a week is not the stress you might think it is.
When I had a small collection, I would water them thoroughly a couple of times each, two days in a row to make sure the medium or mount was really saturated. They were usually bone dry when I returned, but fine.
Another alternative is to put them in a cool, shady room so they'll dry more slowly. Clustering them in the bathtub is a common trick for that.
I am on vacation right now (Outer Banks of NC), and my greenhouse is scheduled to be misted automatically Monday, Wednesday and Friday mornings, after I thoroughly watered them on Saturday before leaving.
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