Probably 20-25 hours story mode + 10-15 more hours if you go for the side quests and all that for 30$ :O (40$ with the "physical" release).
I definitely think it's a fair trade.
I think the Expansion Pass is also included ... ?
For the physical release?I think so, but now Im not too sure.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.