Dec 6 - 50 mins.
Dec 7 - 1 hr 50 mins. Total 2h40m.
Dec 9 - 1 hr 25 mins. Just need to kitchener + sew in ends. Total 4h5m.
Dec 10 - 15 mins. Done! Total 4h20m.

Added puffy paint to the bottoms as a tester to see if it helps with grip. If it does, I’ll be adding it to all Christmas gifts.

Puffy paint works great! It has a kind of sticky feel on slick surfaces. I can still slide if I put a little effort into it, but it’s a huge improvement over unpainted slippers. The dots do NOT need to be large at all - the little smears worked great too.