This wouldn't really be the same, but use a habit tracking app based on streaks (aka not breaking the chain) to make consistent progress on two learning projects on my own time (mathematics and programming).

The goal is small for each (just one module of a textbook per day for mathematics, and a third to half of a chapter of a programming book per day), but it's doable in spare time, and I keep reminding myself that I can only make progress on these projects if I at least hit that goal each day.