That is entirely up to how you prune it, both above and below the soil line. It can be kept very small, under a foot, and in a container that holds less than a gallon of soil, for years and years if you prune roots and top. If you do nothing to the roots, the tree will grow quite large before it succumbs to some problem related to constricted roots and dies.

More important than how large a container a few years down the road, is what size does it need now. To place a tree in too large a container, especially if you're using a potting soil with a large organic component, is to tempt fate in the area of root rot and compromised root function/metabolism.

Al

Most so-called "Condo" mangoes are said to top out at 5-6' tall.

Hi, I'm new to this forum but I just had to ask--is the name of the tree Julia? If so, I was told that as a "dwarf" it would grow to around 15-20 feet tall. Big, but not as big as the usual ones you see in yards. Just curious--and it sounds complicated but how do you prune the roots to maintain "smallness"? I just purchased a Julia and have gone back and forth with my husband about where to plant it. I too would like to keep it in a pot.
Oh, and the nursery told me that it would eventually need a really large pot--big, big--the type you can't move without wheels!
I'd be interested to hear what others are saying...
Thanks,
Lee

Here is a thread that touches on root pruning. After you read it, if you have other questions and Jenanne doesn't mind, I'll answer them.

If you have the requisite knowledge of pruning, and the ability to keep the tree alive, there is no reason you can't keep the tree nearly as small as you wish for as long as you wish.

{{gwi:3269}}
A 15-20 year old fig tree that is under 30" tall. Forgive the twine securing it to the container. It was recently repotted (and root-pruned) and I had just transported it in the back of an open pick-up truck.

Al