This carpet takes about 30 hours to make using a 10 mm hook (which is size N& in the US) and meters of 5 mm thick cotton string. The final size is cm. I use the same kind of string they put in sweatshirts to tighten the hood.
Free Crochet Rug Pattern DIY Free Pattern for Crocheted Patchwork Rug from Ravelry here. If you crochet or knit I’d suggest signing up for this site - it’s free and has many unbelievable free patterns. The PDF pattern for the rug is here.