Months. Long, hard months involving tears:
And I even learned a good way to make picots:
So, there’s your answer. They’re easy to learn. They go quickly. They look fantastic. Anything where you can have fabulous success early on is going to be hugely popular.
Also, I suspect, if someone calls you up and says, “Grandma, I need an afghan for the TV show I’m in the crew on,” this is what Grandma can work you up on a moment’s notice.