Usual LP's r anything between 10 & 16 days in length. If u O'ed on CD25, then AF should arrive on CD39, give or take a day.

My usual LP is 13 days, I can O anywhere between CD13 - 16 and AF will show up exactly 13 days after O has occured (lucky me) unless I am pg (fingercrossed).

Do u temp at all or chart?? If u have been temping (Fertility Friend is a great site for this), then u should already know how long ur LP is, if not, then I would get temping and after 3 cy's u will know what ur LP is (providing u r not pg in that time).

The answer to ur ?? is yes, u can have longer LP's, but there is usually a cause for this, like PCOS, it depends on the length, or of course, pg'y.

Babydust to everyone.