Koh gen doh cotton

Hi all I have took up building my own coils.
The question I would like to ask is I have bought some koh gen doh cotton and I was wondering how much I will need to cut off the pad for a 3mm coil as that is all I will be using and the rda I will be using is the mongrel rda a single coil rda to start off with.Hope some can help.

Original source: https://www.e-cigarette-forum.com/threads/koh-gen-doh-cotton.968419/