Directions say to repeat rows 1 & 2 30 more times, do the decrease rows and then do rows 1 & 2 20 times more.

After doing that I ended up with a slipper that would fit an elephant!

Going to try repeating rows for 16 times and see what I get for a length before I have to bind off the edges.

16 pattern repeats (32 rows) seems to do it. 20 repeats after decreasing the 2 rows is a fine fit for average feet. 28 repeats would be for larger feet.