I don't know very many of us who have that self control. I get bored easily and need several things going at once.
I don't think it has as much to do with self control, but neccessity. I've always loved sewing, but with working outside the home that included extensive traveling, if I was going to get any satifaction in my love of sewing, I had to finish the project I was working on with the time I had to donate to the project. Since I was in sales and marketing, unhappiness with myself did not help my attitude in my work. So, a habit was formed and I still have it! Enjoying this retirement!