Dispersion is roughly 12 days
This study found that only 10% of those with a regular cycle of 28 days had ovulation in the 14th day, dispersion was from day 10 up to day 22. In this study, only 69 out of 696 cycles were regular.
Ovulation occurred as early as the eighth day and as late as the 60th day of the menstrual cycle. Figure1 shows the distribution ...
The rupture of the follicle is totally painless as it is not innervated.
However, some women experience ovulation pain. It is particular to one side, and the mecanism that cause pain are not fully understood. It is maybe due to the excessive size of the follicle that stretches the ovary or to irritation the abdomen.
On mayo clinic . com, it is said