I try to avoid turning the quilt so I do horizontal and vertical as I go. Sashing is usually broken up along the way, either by cornerstones or the horizontal sashing. Now that I think about it, I have yet to get a quilt with unbroken sashing and the one quilt I made myself that way, I left the sashing unquilted (but this quilt was hand quilted). If you mean borders and not sashing I still do each section as I advance, even long feathers. I just hate the thought of reloading. Not sure what my aversion is to it. One reason I know is that I only have a 10' rack and can't accommodate anything longer than 100" if I turn. Most bed quilts I do are at least that long if not longer, so that may explain why I taught myself to be able to quilt long stretches vertically in 20" sections.