Usually up to two weeks.
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During an average 28 day cycle a woman is likely to be fertile between days 7-16 - ovulation typically occurs two weeks before menstruation (there may be a live egg present for up to 48 hours), and she is fertile up to a week before ovulation when there is fertile quality cervical mucus present. Unless a woman uses a birth control/conception method such as Fertility Awareness Method or Natural Family Planning there is no way for her to accurately determine when she is fertile, thus another birth control method should always be used in order to avoid unintended pregnancy.
5-7
In general, there are 5 to 6 fertile days every month (the day of ovulation and the 5 to 6 days before ovulation). So there are 60 to 72 days a year that a woman has a chance of becoming pregnant.
The average menstrual cycle lasts 28 days, from the start of menstruation to the start of the next menstruation. The "bleeding phase" typically lasts 5-7 days.
It may last for one week or so..