I finished knitting a scarf tonight using Bernat blanket yarn ("Sweet & Sour"). The skein is 300 grams/10.5 ounces and I used a 6.5 round needle.
I knitted each row (garter stitch). I cast on 20 stitches and kept knitting until I ran out of yarn. The scarf ended up about seven feet. It's soft and thick and warm!