There is no definitive answer to this question, as the length of a woman's menstrual cycle can vary greatly. However, a missed period is generally considered to be a missed period if it is more than 35 days late if a woman has a regular cycle.
Here are some factors that can affect the length of a menstrual cycle:
- Age: A woman's cycle can become irregular as she approaches menopause.
- Stress: High levels of stress can disrupt the hormonal balance that controls the menstrual cycle.
- Weight: Being overweight or underweight can also affect the regularity of periods.
- Medical conditions: Certain medical conditions, such as polycystic ovary syndrome (PCOS), can cause irregular periods.
- Medications: Some medications, such as birth control pills, can affect the length of a menstrual cycle.
It is important to note that a missed period can be a sign of pregnancy. If you are sexually active and miss your period, it is important to take a pregnancy test.
If you have concerns about your menstrual cycle, it is always best to talk to your doctor.