Thats a sleeve.
I’ve already knit the body.
The yarn only arrived on Friday. I cast on immediately, but had to frog and restart on Saturday night when I realised it was going to be too small. Today is Wednesday. At this rate I’ll have a finished O W L S sweater ready to wear by Sunday!
It’s a chunky yarn and I’m using 6.5mm sticks, but still… I think this may well be the fastest sweater EVER.