How Many Pseudobulbs is Considered Blooming Size?

[Spotted Milti]

I've bought a couple different orchids in the past from vendors as seedlings and some have lived with me for 3-4 years at this point. One of them is a Cattleya though I'm not sure what type with about 5 or 6 pbulbs and another is a small Renanthera I just got this fall. The renanthera is still relatively small and I know it doesn't grow pbulbs but just wondering how "big" these guys need to be before they're considered blooming size? I also have some small bulbos that I'm not sure how big need to get first