regarding how long the ingestion should take to implement, I'm going to say: it depends!

It depends on how complex the models are, because now you need to parse your model before inserting them. Which means you need tables to be in the right format. And then you need your loops, for each file you might have to insert anywhere between 5 to nested 20 entities. And then you either have to use an ORM or write each SQL queries.

All of which I could do obviously, and isn't rocket science, just time consuming.