Container mango tree question

[bovine421]

What is the most ready to be picked mangoes you've seen in a 15 gallon container? Same question for a 30 gallon container? What I'm trying to ascertain is what number of average sized mangoes can be reasonably and consistently produced in a container. I want to give my daughter some realistic expectations of what can be achieved.
So far I've seen many photos of flowering mangoes and tiny mangoes in containers but yet to see some with full-sized mangoes.

[JulianoGS]

There is a container\condo mango facebook page you should check it out.

[bovine421]

There is a container\condo mango facebook page you should check it out.

I have that's where I've been studying photos.
The reason I asked here is I want the cold hard truth not wishful thinking happy talk. My uninformed guess would be from 3 to 6