Nipple Stimulation to induce labor

Emily • My cute hubby is 25 and I am 22. We made a cute person named Thor born on June 29th!
So I'm 40 weeks and 1 day! I'm trying nipple stimulation for the first time today with my breast pump. 15 minutes on each breast followed by 15 minutes of rest. For the ladies who have done it in the past, how long after doing this did your contractions start?