Yeah, my saw takes a little bit longer to go thru rounds than yours, and I eyeball measure, close enough is good enough, +/- 1/2"
That sure is a nice view for some wood cuttin! .. Crzy, im not usually one to preach safety but dang man where are your glasses? Trust me, coming from a guy who's had more eye injuries than i care to mention. My last injury was actually a chip that hit my eye and left a piece of splinter stuck in it. If i start cutting and realize i forgot my glasses I'll stop everything and go grab em.