How many plants do commercial orchid breeders work with?

[katsucats]

Just out of curiosity, how many plants do orchid breeders select from in a typical orchid breeding program? I'm assuming due to the expense of growing tropical ornamentals and time involved, very few would really grow out thousands of plants, do open pollination or keep multiple breeding lines to maintain genetic diversity and vigor, like they might in cash or food crops. With orchids, each generation might take a decade.

On one end of the scale, maybe most breeders just keep clones in their breeding stock and only cross between them. Breeders that grow out outcrosses might select heavily for favorable traits so they don't have to dedicate so much space to one kind of plant.

So my question is, let's say flasks get made between 2 breeding lines of a species, and the goal is to pick out "the best" offspring by some desirable traits (e.g. largest flower, etc.),

1. How many seedlings does a breeder grow from the flasks in order to have enough diversity to select for the next generation?
2. How many plants actually get selected for breeding the next generation?

How common or rare are these orchid breeders as opposed to people who just buy and cross awarded clones, self them or send them out to a lab to get meristemmed, or buy flasks and randomly make crosses between siblings (e.g. out of 10-20) without a deliberate selection effort?