Thread:Hitsuji Mamoru/@comment-27971189-20180124150902/@comment-27971189-20180815130254

I remember Tsunako once said in interview that designing each Neptunia character actually took months (about 3-4 months), so its really one tough work when it comes to character design.

As for finalization that depends on the illustrator themselves;

Experienced ones, like Soejima (Persona), and Tetsuya Nomura (Kingdom Hearts, FFX) can just took 7 hours to finalize the design before handing it to direction comitte or after discussing it with art director.