I have 100 slots but usually I have about 20 free slots, atm I only have like 8 free slots because of the dragons from the previous events. I do not usually stockpile manyus also, I use them all by the end of the day since I work on all of my girls and ive got a lot of girls to work on.

I still do plan to expand my slots but only if the need arises, like getting 90+ unique girls (currently at 77 including 2 and 3* girls + 3 revival girls)