I get about 1 1/2 rows and the bobbin runs out. Sometimes 2 rows, depending on the pattern/design. I also have a stitch regulator and it makes such a difference. I had to order mine and it took 2 weeks to arrive. When I got it on, what a difference. My Pfaff has a light that blinks when the bobbin is low. I am a bit spoiled. - I do usually pull the bobbin thread up through the quilt before I resume after changing the bobbin. - When I use a panto it is hard to watch if the bobbin runs out as I am watching the design, so I measure how long it lasts with the first whole bobbin and mark the quilt or panto where it should run out. When I do free motion, it is easier to spot.