There is no natural way to shorten the length of your period. If you are taking the 21-day Birth Control pill, starting a new pack early may shorten your period slightly. However, doing this may affect the efficiency of your birth control.
You have to see a doctor for that. One thing you can do to become regular and bleed less and for shorter time is to get on the birth control pill.
It varies, but there are short-term cycles that lasts probaly 36 moths or so. But there are long term cycles that some say swing in long about 50 year cycles, but these thing vary.
they dont have periods.
Short
They can be as short as 3 days and as long as 7 days.
They move a short period of time because hopping is tiring to the legs
Nutrients spend different amounts of time in storeswithin the atmosphere, oceans, and land. Nutrients are stored for short periods of time in short-term stores, and are stored for long periods of time in longer-term stores.
The average menstrual cycle is 28 days long, but everyone is different. Many women will have cycles that are a lot longer than average, it's also normal for there to be up to a weeks variation between cycles or if a woman has irregular cycles she may have longer cycles and shorter cycles. There are also girls who do not have periods at all because they don't have the correct anatomy.
Evolution.
Evolution of man.
Pulse-modulation
the pacific ocean
Vegetation in the desert has adapted to be able to survive the hot climates. They have very long thick roots and can store water for long periods of time.