You have to keep up the rhythm
As long as I can run a certain distance, that’s all I care about. Sometimes I run fast when I feel like it, but if I increase the pace I shorten the amount of time I run, the point being to let the exhilaration I feel at the end of each run carry over to the next day. This is the same sort of tack I find necessary when writing a novel. I stop every day right at the point where I feel I can write more. Do that, and the next day’s work goes surprisingly smoothly. I think Ernest Hemingway did something like that. To keep on going, you have to keep up the rhythm. This is the important thing for long-term projects. Once you set the pace, the rest will follow. The problem is getting the flywheel ot spin at a set speed — and to get to that point takes as much concentration and effort as you can manage. — Haruki Murakami, What I Talk About When I Talk About Running
How long do you have to do it? How many hours a day? Every day or a few times a week? This quote from Murakami addresses the heart of the issue: to do any kind of long-term project, you have to dedicate enough time and revisit the work often enough to keep up the rhythm. You have to end one session excited about what you will do next time. Then you have to come back before you forget what you were excited about.
“[T]o get to that point takes as much concentration and effort as you can manage” — but if you can put in the effort and make the time, you can help your child get into the habit of doing meaningful work.