That's quite a wait. Hope it turns out to be a good one.
Some of the west indian seedling avocadoes turn out to be duds -- producing 2 or 3 fruits per year despite heavy flowering on a gigantic tree. I've seen this on some of the neighbors' trees.
My seedling russell (planted in 2007 or 2008) flowered for the first time this year and has only produced about a dozen or so fruits despite being like 20 feet tall. Hopefully production picks up next year. If not, she might well get a top workin.
My little 4 foot tall florida hass has a couple dozen fruits on it :-).