After a gap, I've been testing for Kathy again, and here is the result:
And here are the gory details:
Thread: Anchor/Red Heart size 40 (2 strands) initially and then size 20 (1 strand) later. Stash busting!
Hook: Tulip 1.5 mm/size 2. It's one of my favourite sizes.
Pattern: Torchlight doily from Katchkan
Time: About 10 days
Extra: #1 Got back to thread crochet after a few months away