With a 1.75 hook chain 61
Miss 2 chain 1 treble in each chain to end [us double crochet]
Treble each row till it is long enough for you.
Mine is 1.70m long.
I worked my stitches so the knots all are on the same side, so one side you can see the different colours of the yarn, while the other side is more raggy with all the ends.
Next time I crachet one I will do it with a bigger hook, because as this one is soft would like it even softer.