My batting says 4” apart, but the quilting is 3” one direction and 9” the other, based on the shape and pattern.
I do not have a ruler/ruler foot, I have a machine that can do free motion, but it’s not fancy (and I’m not great!) I was honestly debating running 1” parallel wavy lines from one end to the other over everything, but some of my stitch in the ditch spots will be perpendicular to that, so I didn’t know how bad or noticeable it was going to be.