How do you make an invisible 2 Potion?

Add Items to make this Potion

To make a Potion of Invisibility (8:00), you will need 1 Potion of Invisibility (3:00) and 1 redstone. Place the Potion of Invisibility (3:00) in one of the bottom boxes in the Brewing Stand menu. Then add the redstone to the top box.

How do you make an invisibility Potion in 8 min?