Hand Rolled Hem Handkerchiefs DIY

The Purl Bee tells how to make Hand Rolled Hem Handkerchiefs. I have been cutting up old shirt and flannel boxers to make un-hemmed hankies, which is fine. They'd stay nicer longer if I'd hem them though. The Purl Bee says it can take one hour per hankie, though, so we'll see how badly I want to...