I've had my cycle two weeks since december, is this the start of menopause? I just turned 40 and have been in peri-menopause since my early thirties.

MENOPAUSE AT 40. This could be the beginnings of an early menopause. Check with a gynecologist who might order some hormone testing.
Doctor can evaluate. The average period lasts 4-7 days. It is not normal for a period to last for two weeks. You might consider seeing a physician for an evaluation of the problem. When a woman is approaching menopause, her menstrual cycle length typically becomes shorter. This could lead to more frequent menstruation or irregular bleeding as well.