[Someone1234]

> How long do you think it would take to build something like this?

If you were starting from complete scratch, 15 years (assuming 1-2 people). But the reality is you aren't starting from complete scratch because the academic community in particular (and previous technology) have a great deal of prior work in this specific area.

So maybe 3 years until you have "something basic" and then 5 years until it is really profitable (presuming its accuracy rises year upon year). That's if you exploit all academic work you can find and try to build on existing technology as much as possible.

You could maybe do it in about 1.5 years with a large team.