Without paying anything there's a solid 60~ hours of content available from 1 day. if blasted out in a week this well get you to adventure Rank(AR) 33-35. There's story content AR40+, but there aren't enough collectables in the game to get there I a week, so you'll have to log in and do daily missions everyday for a few months.
The graphics still amazingly good even on the lowest possible setting, and the combat even not as fast as Honkais, was pretty satisfying enough. it became a grindfest endgame and the world sometimes go too hard on you certain ar, but still manageable. only the camera needs improvement especially while fighting on hills, keep panning on the grass that blocks 80% of my view.