cross stitch

I'm not finished with the cross stitch yet. When I first got it, I did it for ages, but now I keep taking long breaks between sessions. I'm not bored of it, it's just that there are so many things to do that I can't fit the time in. When I do do it though, I get a bit annoyed because on the instructions it says to do a row of half stitches and then go back and complete them, instead of just doing a row of full stitches. The intructions say to do it that way because it doesn't waste use up as much yarn.It annoys me because it is not as fast and satisfying.