I have a 3 and a half hour course (practical based) coming up. I'm due to come on either the day before it or on the day itself. I mentioned to the person who has booked me on the course about needing to leave to change at least once, and apparently it's not normal to have to change pads/tampon/mooncup that often.
So, women of MN, on your heaviest day how long can you go without changing?