I use paper too, and have designed a small notebook around this idea of longer term goals with "crumb-size" daily actions: https://twentyweeks.com (shameless plug for my side project)
It mostly came down to math, and that 48 pages is typically the max number of pages for a saddle-stitch book. I explained a little bit more about the design process here if you're curious to know more: https://1rick.com/designing-bluebird.html