I got my first latouria dendrobium this Feb 2015 during the Pacific orchid expo, called Dendrobium Roy Tokunaga 'Spots'. It was in bloom then, and still in bloom this June, it just dropped one bloom in Feb maybe it was getting used to our place, but after that, just going strong and making new canes too.
And agree with Phals, they do bloom a long time, mine lasts for 6 months and sometimes it even makes a secondary spike, so at times almost a year in bloom.