Finished the Lapel Rnd Section

Ok, I've finished the 10 rounds for the lapel pattern change and I'm measuring out at about 36" diameter on the XL size. I have 56 stitches per section, and the pattern tells me I need to work the standard twist pattern now until I reach 67 stitches per section. I'm estimating that that will put me over the approximate 40" diameter. My gauge has been pretty consistent so far, so then the question is--do I stop when I hit 40" (guessing at about 63 stitches) or stop when I hit 67 stitches? Any thoughts?