No! It isn't where a Chinese chef requires no more than 239 grains of sesame to be used on a 烧饼(barrel toasted pancake) lest one achieves 240 and expel excessive wind.
Instead of an undirected 20% project, one may plan for each employees to participate on two projects investing 40% of their effort into each. The extra 20% is headroom for coffee/tea drinking, context switching, teaming and other human overheads. (Such as your 20% project)
Obvious tunable parameters include whether the tasks are performed exclusively or simultaneously with prioritization at any moment. The interval of processing—beginners should start with 1 day for each task switching 4 times a week for a normal work week. Staggering project phase is usually a big plus. The usual management tools like OKR's, setting deadlines and priorities, having daily blocker analysis, and standing up once in a while all apply.
Effectively, a lot of people already do this maybe with even more tasks at different stages of completion out of self-optimization or joy. It has similar effect as computer multitasking. When one of the tasks becomes blocked, often due to either externalities, monotony or fatigue, a different task can be worked on using available resources. It is reported by researchers that human have yet to developed widely deployable means of correctly and efficiently multitasking with one brain. But for most people, switching between just two tasks balancing cognitive and physical load is doable.
In the post-COVID work from home era, we lose some valuable commute time where our mind and body recover its depletions, this 240 rule can produce superior personal aggregate performance over extended period of time.
Let's get 240!
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