User blog comment:IamJakuhoRaikoben/Chapter 515: I Am You... You Are Me, Review./@comment-29778526-20161221163752/@comment-7418318-20161221174431

The chapter showed 4 frames to represent the entire 3 years. We have no idea when they started to torture her.

In an extreme case it's even theoretically possible (though very, very, veeeeeery unlikely) they only started that a month before she broke out.