Though the length and regularity of a menstrual cycle may differ, the average duration of a complete menstrual cycle is 28 days (though healthy cycles can run from 21-36 days).
Ovulation should occur about 10 to 15 days into the cycle. Anything more than 15 or 16 days is considered a late ovulation. You can still get pregnant if you have late ovulation, although it can be more difficult.