Opk....help

Rachel • We have been TTC for over three years. We have a 6 year old son and another 6 year old boy, of whom we have Guardianship.
I took an OPK yester day and it was positive. Out of curiosity, I took another this morning and it is positive....how long does the LH Surge last, and when exactly will I ovulate? I wanna make sure I plan this right...lol