Hi MLV,
I would say that your cats. probably would like a little more light that what they are presently getting. I keep mine in a South west window and they recieve direct sunlight for a good part of the day. The flowers will last from a few weeks to a month or two more depending on the type of cat. It is difficult for you to know how log the cattelayas that you have purchased have been blooming as well.
As far as cymbids, I have 12 and most of them have flowered from Feb/Mar till present and are almost done. Am not really up on them but would suggest that again,different types of cymbids, different flowering times. Will let others chime in and you should get lots of useful info.
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