Productivity isn’t about time management. It’s about attention management
Being prolific is not about time management. There are a limited number of hours in the day, and focusing on time management just makes us more aware of how many of those hours we waste. A better option is attention management: Prioritize the people and projects that matter, and it won’t matter how long anything takes.
This reminds me of agreeing to a fixed scope: all emphasis is placed on delivering a set number of features irrespective of their value or quality. In fact, in this situation, the only thing that can give is quality.