How many squares do you use?

From Yahoo in the odd news section:

Sheryl Crow is suggesting a bottom-up solution to wipe away global warming: limit each trip to the bathroom to one piece of toilet paper, according to a statement on the US rocker's website.
...

"I propose a limitation be put on how many squares of toilet paper can be used in any one sitting," she explained.

"I think we are an industrious enough people that we can make it work with only one square per restroom visit, except, of course, on those pesky occasions where two to three could be required."

...

Crow's spokesman was not immediately available to elaborate on the singer's proposals.

And today on her website I found:

And by the way guys, the toilet paper thing...it was a JOKE!!

So, the question of the week is: How many squares do you use? Just estimate an average, or count the next time you 'go', whatever.

For my answer, I think probably 15 for a 'number one' and way more than that for those "pesky occasions."