how long does it take to beat the game?

[Millerbertinho]

How many hours? Does it feature all chapters in the manga or only the anime events?

[Beta The Magnet Warrior]

It has most events from the anime. It goes a little beyond where the anime ended, but no major spoilers happen. To complete story mode? Probably around 5-6hours. Also in order to unlock episodes and cutscenes from the epilogue, you need to clear a bunch of missions after you have finished story mode a.k.a. Attack Mode. Gets kind of repetetive but this is where you can use various characters and join online co-op to complete these missions. After you finished the epilogue for the first time True Attack Mode unlocks. A much much harder version of Attack Mode. It could take you double the time to complete this version if you are not prepare with well developed gear.

[✨Nutkun7993✨]

Anime season 1 + little leap into manga with beast titan arc. But with little spoiler intently made for those who haven't read manga, it's more like an anime season 2 preview.

To just complete story mode, you only need 5-8 hours depend on how fast you can learn. And 20-30 hours to get through survey mission just to unlock final chapter and then another 60 hours to complete everything in this game.

Most people usually have enough when they complete last chapter because beyond that point it's for completionist.