Yep.
I have an empty spot in my tent, because I wasn't vegging my girls large enough to be ready, because I didn't have enough soil ready.
There is always going to soil cooking in a perpetual - somehing I didn't really understand until my first harvest.
Working back from my flower room, the number I am working with right now is 10. 10 large fabric pots worth of soil: 4 in flower, 4(or 2) in veg, 2(or 4) cooking.
There are also several seedling pots in veg, but the soil comes out of the cooking soil and goes into the the large veg pots along with cooked soil, so I just count them as part of the cooking soil.
According to this plan, I need storage for just as much soil cooking as I have soil in the flower area. I also mix and amend soil after every harvest. I started out thinking of a perpetual grow using equal sized veg and flower areas. I now have to add in an equal sized soil area.
Right now, I'm trying to squeeze the soil cooking area into the veg and flower area. I don't know if the plan will work yet, but it's good to have a plan