After the red, there will be two more colors before the colors repeat.
This is a basic ripple afghan. The pattern is three rows of double crochet in whatever wonderful color(s) you have handy followed by one row of single crochet in the highlight color.
I'm using fingering weight/sock yarn with a size G (US) crochet hook. Starting with a 219 stitch chain gets an afghan about 28 - 29 inches in width. Since it's not done yet, I can't tell you how long it will be. Well, that isn't strictly true. I could do the math to figure it out, but this is the weekend and I don't do math.