Many cool growing cyms can hold their blooms for quite some time, 2-3 months. (downside- very large plants, need a lot of light to bloom, as well as a period in late summer-fall of cool nights to initiate spikes.)
Dens from the latouria group can also hold blooms for 3 months, and don't need as much light to bloom as cyms. They also can bloom from old canes as well as new, and can get a lot of spikes on one plant. So as early spikes start to bloom, there are new spikes starting. Plants can be in bloom for quite some time.
Haraella retrocalla - a very small plant, can bloom almost continually.
Ascda Su Fun Beauty can bloom 2-4 times a year (needs strong light, but small enough to grow on a windowsill)
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