To make it, I just started crocheting a circle and carried on going until it was a decent size. This one measures about 28 cms across, so will easily take a casserole dish.
Crocheting with this yarn is definitely tough on the fingers. I ended up with a bruised thumb and a blister on my finger. Thankfully, they only took a couple of days to heal. I imagine, it would get easier the more I use it.
In complete contrast, I went from working with this, to knitting with 4 ply yarn. It feels tiny in comparison, but it's a joy to be working with something so fine.