Pokémon Crystal is an enhanced version of Pokémon Gold and Silver. It introduced several new features, including additional story elements involving Suicune, a Battle Tower area, the option to play as a female protagonist, animated Pokémon sprites during battles and various minor improvements.

How long is Pokémon Crystal?
When focusing on the main objectives, Pokémon Crystal is about 28½ Hours in length. If you're a gamer that strives to see all aspects of the game, you are likely to spend around 132 Hours to obtain 100% completion.

Pokémon Crystal will take you approximately 4 Weeks to complete if you play for 1.5 hours a day while focusing on some extra content.