Sophronitis coccinea - how many years to bloom?

I don't know how anyone can give a reasonable answer to that, as that is affected by both individual plant genetics and how well you provide the right culture...

 

The hackneyed answer to this type of question concerning seedlings of the Cattleya alliance is from three to five years, depending on the size and vigor of the seedling. In reality, there are too many variables that can affect when a plant like this will bloom. However, having said that, it has been my experience, killing Sophronitis hybrids, that the overarching factor in their growth is environmental humidity. They grow in cool, humid and sunny areas in the mountains, replicating this environment is a real challenge for most.