Helping my in-laws make some masks for a local Toyota plant. I did 33, have 120 that are cut and ready for me to do. They needed 1000 done! 7.5 hours later, the first set of 120 of my father-in-law’s masks are done.
I did another 100 done for my in-laws. And no thread left. A spool of thread with a zigzag stitch does approximately 125-130 masks.