Rose Maximum Tools Storage at the sidehill

I have refrain from using Rose up till now but gave in finally as I got a free booster for her for 2 days. I found that as she collect the products, tools such as BEMS LEMS axes etc appear at the sidehill. If we do not collect the tools from the side hill, what is the maximum tools at the side hill before they stop appearing. Many thanks!

I think you can keep ten up there.

Yes indeed it seems it's 10 the max! I have started collecting the items whenever it reach 10 to maximize the use of Rose. Many thanks! ��

And they will stay there forever or until you collect them. They don't go away when the helpers stop.