Horizon Forbidden West will take over 60 hours to complete

techradar.com:

Horizon Forbidden West's story will be roughly the same length as Horizon Zero Dawn's, according to the game's director.

Speaking to GamePro, Game Director Mathijs de Jonge revealed that Horizon Forbidden West's story is similar in length to its predecessor — however, the overall scope of the game is much larger. 

Horizon Zero Dawn's main story clocked in at around 22 to 23 hours (according to How Long to Beat), while it took roughly 45 hours to do the main quest plus extras, like side quests. To fully complete everything on offer in the game, players had to clock over 60 hours of playtime.

De Jonge's confirmation that Horizon Forbidden West's story will be roughly as long as its predecessor means that we can expect the sequel's main story to also clock in at over 20 hours but, with the scope of the PS5 sequel being much larger, we imagine that the time to fully complete the game — or simply to do extras — will take a bit longer than in Zero Dawn. How much longer hasn't been confirmed by developer Guerrilla Games, or by de Jonge.

While 60+ hours to complete a game is a lot, not everyone will be wanting to fully explore every nook and cranny of Guerrilla Games' post-apocalyptic western US — but it's still worth being realistic about how much time you'll likely sink into Horizon Forbidden West. 

Sure, the main story will likely take around 23 hours to complete, but the majority of players — even if not playing the game to full completion — will undertake at least some of the side quests and extras on offer. After all, why would you play an open-world RPG and not explore at least a little bit?

This means that, realistically, most Horizon Forbidden West players should probably expect to spend between 25 and 45 hours playing the