From two leaves to that size, you are doing an incredible job. How do you grow it? Mine is slightly bigger than yours and it only produces about three leaves per year, which I would say it is a slow grower IMO for Pleurothallids.
Did you get it through a trade? I hope no one should sell a two leaves plant...
It likes my basement, uncomfortably warm in summer cold in winter. I mist three times a day. I try to fertilize twice a week with lowes two part fertilizer. I had to rethink my previous statement. This was pretty sad when I bought this. It was falling off the mount. This one was bigger than I had mention before. I believe it had four leaves. The peice that fell from the mount in shipping had two leaves and one tiny root. I planted it a pot of live moss and now it has eight leaves.