Harry Potter And The Half Blood Prince Ds Game Chess How Do I Mash Potion Ingredients In Harry Potter And Half Blood Prince DS Game Without Running Out Of Time?

How do i mash potion ingredients in Harry Potter and half blood prince DS game without running out of time? - harry potter and the half blood prince ds game chess

I can not fill the bottles fast enough, and I'm so fast I can dive with the stylus, but I always ran. Can anyone help?