how much toilet paper from the roll should you use each time?

depends if your partner is waiting to use the bathroom and you are almost out. sometimes just a1/2sheet to avoid an argument

On the average I use 2 or 3 squares. That seems to work for me.

I don't use that much. Maybe like 1 or 2 grabs =]

4 sheets

I use way too much but I think for both jobs you should use a bunch, but nicely fold it so you can use more of it.

it depends on what you did(#1 or #2)

We should use one square to help the environment XD

Enough to get the job done properly...

one square per visit

The whole role if need be.