Hass is not the best choice to grow in Fla they don't like our hot damp summers and are not very cold tolerant... Growing from seed is a real crap shoot I have a 7 yo Brogdon still waiting for fruit.... It may or may not happen but with 17 your bound to get a few if you can keep them in good health. Put them in the ground and see what happens, If you want fruit go get a grafted brogden or winter mexican and you can have fruit in a few years......

I wish you luck ! Planting avocado trees from 3 ft tall specimens in 3 gal pots from Lowes is stressful enough. But trying to grow them from seed ? With only one type ? Why the torment ?
I bought and planted in the ground in February, here in zone 10a, in SW Fla, one Hass and one Bacon avocado tree.Type A and B,..trying to give them the best chance.
They are now a spindly 4 ft tall with mucho fresh, vibrant looking leaves sprouting, The Bacon has about 10 golf ball sized fruit that are just nice to look at,..have no hopes of harvesting anything however,..this year !
But in another 3 years or so,..who knows ? If you are serious about harvesting these luscious fruits in your lifetime, I suggest you get serious.
Whatever your plans for the future are, I wish you luck !