You just helped me much more that you could have guessed: see, they talked about agendas. And it just occurred to me that the folding method devised by the OP yields a 7×5 grid, which is exactly what I need to fit a month worth of agenda. The squares are relatively small, but they suit my needs.
So, an A4 sheet of paper is worth 2 months of agenda. 6 will last me a year.
I'm too lazy to buy an agenda, but now I have one. Thank you.
It's turning a single sheet of paper in to a mini-book - they have an application for download that will convert a pdf in to "pocketmod" physical format. You basically concertina fold the page and make a couple of cuts.
So, an A4 sheet of paper is worth 2 months of agenda. 6 will last me a year.
I'm too lazy to buy an agenda, but now I have one. Thank you.