The media is okay, traditional potting soil is NOT used for orchids!! Orchid roots need air movement to survive. Soil would smother the roots causing them to die.
Your plant is a Dendrobium phalaenopsis not to be confused with a Phalaenopsis. Yours needs a few hours of sunshine and watered when the media is almost dry.
Individual flowers normally last 3 weeks or so but the life of a flower is shortened by the heat. Yours could be folding prematurely due to the shock of relocation to your home.
Welcome to our forums and the NGA. There are lots of threads about growing orchids and lots of great growers here to assist you.
