How long are the dlcs?

[Mr. Frank]

I'm talking about the nightmare and year of the snake ones

[sai Dylan]

With collectables they take awhile, but are a alright length without them.

[Inquisitioner]

They're both very short compared to the main story. I'd guess if you ignore collectables they could sustain you for a few hours at the very least. But worth doing to unlock some extra stuff for main game and variety of gameplay. Fun and worth it for sure, what little is there is good essentially.