Just looking up menstrual flow volume, and according to this webpage:
www.cemcor.ubc.ca/resources/very-heavy-menstrual-flow
"That means it is normal to soak one to seven normal-sized pads or tampons (“sanitary products”) in a whole period. "
SEVEN!!! Using super-plus (or even super-plus-ultra), I can get through 4-5 a day on bad days (including overnight). Changing every 3-4 hours is usually bad enough. So if you only soak through 7 in a whole period................
The references they give on this webpage are rather old (1966 & 1971):
Hallberg L. Menstrual blood loss. Acta Obstet Gynecol Scand 1966; 45:320.
Cole SK Sources of variation in menstrual blood loss. J Obstet Gynaecol Br Commonw 1971; 78:933.
From my anecdotal experience, only if you soak through the largest in less than an hour or two will anyone think that is infeasibly heavy flow. If you can go out, get the bus, see a film, and change again when you get home, you're lucky.
If these are the nonsense figures being hawked around, no wonder about the tampon tax, they're convinced we should all be able to make a box of 16 last two months.......................
Or perhaps means I have had menorrhagia my whole menstrual life, and no one ever told me. Granted, the only reliable comparison I have at the moment is the missus, but she seems to get through a similar number to me. SEVEN, the whole period! I don't believe it! 