The only way you can delay menstruation is by taking birth control pills.
When the uterine lining sheds this is typically called menstruation. Although women on hormonal birth control will experience a faux period in the form of a withdrawal bleed.
It should be the same amount of time as when NOT on birth control.
The withdrawal bleeding is not regular menstruation. Birth control changes the hormones in your body and suppresses ovulation, therefore there's no egg that was released to cause menstruation. That's why birth control prevents pregnancy.
If there are no other problems, and the bleeding is due to hormonal imbalances, birth control pills are often prescribed to bring the bleeding under control and regulate menstruation.
uhh.. wear a "heavy flow" tampon?
The Pituitary Gland and Ovaries.
Birth control pills help . Otherwise there isn't much to do.
There is no "follicular phase of menstruation" when you're on hormonal birth control.
Birth control inhibits fertilization, not menstruation. Menstrual cycle will still continue.
Taking two birth control pills could delay menstruation, or could cause breakthrough bleeding. It's a gamble.
In theory, anytime after menstruation has begun.