Usually anywhere from three to five days.
No women fail to menstruate. It comes naturally.
Their body
You do menstruate for two days because within the two days the ovum that is released is usually completely out of your body.
No, transwomen do not have uteruses or ovaries. Transwomen cannot menstruate or bear children.
yes
Yes!
They had peasant women menstruate for them!
Yes, it is possible for a girl to menstruate for just two days. If you are worried, you can contact your doctor for a complete diagnoses.
I'm not sure what you mean asking if it 'gets to them'. Most women menstruate, this is a normal occurrence so no reason for it to bother other women when you menstruate.
Some rough figures... 7,000,000,000 people on the planet = 3,500,000,000 women. 70% of those will be either pre-pubescent or post-menopausal. Leaving 1,050,000,000 possibilities. Divide that by the number of days in a year - and you get the averagefigure of 2,874,743
They suffer iron loss when they menstruate.
No, not every female gets her period. If talking exclusively of those who are biologically female there are those who don't have the anatomy to menstruate or their bodies don't produce the hormones needed to have a menstrual cycle. Pre-pubescent girls don't menstruate and women past menopause don't menstruate, also women who are pregnant won't menstruate during pregnancy (sometimes for longer if they breastfeed), and women who have a hysterectomy to remove the uterus.