No--magic loop doesn't require you to have a 29-inch head.
Today I took my grandson to a birthday party. When we left and he noticed I had my knitting bag, he knew I'd be staying. The party was at a karate school, and he had such a good time that he asked me to sign him up. My first thought was that it would give me another hour a week to sit and knit!
I always hope there's a long wait at the doctor's, too.