Actually, if they are in a tank, and there's not too much breeze around it to draw the moisture out, you may not need to completely seal it up. Likewise, they will basically "harden up" naturally.
Temperature and light will likely be the determining factors on when you'll see new growth, so just keep an eye on the roots. When you're sure you've observed appreciable growth, the larger plants will likely be ready to move on and out of the tank. I like to use the "3-inches of roots" gauge - if the actively growing plant is large enough (your 3"-4" encyclias are probably there), if they have 3" of total root length (3 x 1" or 1 x 3"), it's time.
As to whether to pot them or mount them, that depends on your gowing environment, as both plants can do well either way.
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