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Maker's Schedule, Manager's Schedule
Software entrepreneur Ray Ozzie has a specific technique for handling potential interruptions — the four-hour rule. When he’s working on a product, he never starts unless he has at least four uninterrupted hours to focus on it. Fractured blocks of time, he discovered, result in more bugs, which later require fixing.
Shane Parrish • Maker vs. Manager: How Your Schedule Can Make or Break You
One of my favorite time-management essays is “Maker’s Schedule, Manager’s Schedule” by Paul Graham of Y Combinator fame. Give it a read.
Ferriss, Timothy • Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-Class Performers
The Slack approach seems smart: 25 minutes or 50 minutes. Then if you’re scheduled back-to-back, you’re not late for your next stop. Maybe you can even grab a coffee.