Where to find info abt orchid fast-growing or not/determine mature size?

[King_of_orchid_growing:)]

Your Miltonia sounds like one of the fast ones to bloom from seedling me.

It's unrealistic to want your orchids to bloom within a year out of flask. There's only a small percentage of species that can bloom in flask. And these may or may not be difficult to grow. Phalaenopsis appendiculata is one of those that are able to bloom in flask, but have the disadvantage of not being an orchid for the beginner as they take a long time for a miniature to establish itself.

The majority of the ones that are popular amongst the average hobbyist takes about 5 years (give or take) to get to blooming size.

If you want non-stop continuous blooms with relatively rapid growth, most Pleurothallis is the way to go. But they're either not fragrant, have a pungent odor (smells like raw potatoes), or may smell nice but you have to put your nose to them. There's also the thing with most species having small flowers that look super weird.

To date there are only seedlings of the larger Pleuros which may be slower growing compared to their smaller brethren, but still can outgrow a Phal.

There are only a few orchids that are so fragrant that all you have to do is stand within 5 ft of them and you can smell them. The ones I've grown and know of the strength of their fragrance are:

Aerangis fastuosa (the entire room was fragrant)
Brassavola cucullata (could smell it from one end of the porch)

There are a lot of very fragrant ones too, but you were asking for ones that you didn't have get close to or stick your nose to.