The playtime of Drift (漂流) largely depends on several factors, such as your skill level, the difficulty setting you choose, and how much you want to explore.
In general, a casual player can expect to spend around 10-20 hours playing through the main story quests. However, if you’re aiming for completionism or wanting to thoroughly explore the world, it’s not uncommon for players to sink up to 50-100 hours into the game before feeling like they’ve seen everything.
Of course, these estimates can vary depending on your individual pace and preferences.