Far less. It does not seem any more complex than something like Gary Gigsby's War in the West and while it has a hill to climb if you want to learn how to play it, it is far from a 1500 hour game.

There are absolutely computer wargames that can do this.

Here's a Let's Play of War in the Pacific that was played at one day (real time) per day (game time) - for 1320 days. And as you can imagine, it can very easily take an hour or more per turn. https://lparchive.org/War-in-the-Pacific/

There is a reason why most early computer games were more or less straight translation of boardgames of this kind...