How long it takes for your fluffies to grow will likely be different. Hell, even I don’t agree with this age chart anymore. Though I think fluffies would be able to age up quickly, freeing the mare to have more foals. Mice can have 5-10 litters a year, and guinea pigs can be weaned at 2 week (3 optimal).
This was more for a rough look to fluffies as they age and some behavior development.