Weeks, if I remember my first grade teacher's butterfly project right. And even then, going nothlit means your original body is lost in Z-space. Even if it somehow suddenly reset the morph clock upon emerging from the chrysalis (which makes no sense, it's just normal insect puberty, not altering DNA or anything, no real catalyst there), butterfly should've become her new base morph, the same way Tobias stayed locked into hawk to regain his morphing powers.
Makes no sense at all. I call Ellimist shenanigans.